Baker Street and Gloucester Place 2-way System
Transcript of Baker Street and Gloucester Place 2-way System
The ConsulTaTion has now ended.
we have received Cabinet Member approval to undertake implementation of the Baker street Two
way scheme.
You are not viewing the most recent documentation.
Please visit Building the scheme
Air Quality Assessment:
Baker Street and
Gloucester Place 2-way
System
March 2016
Baker Street and Gloucester Place 2-way System Air Quality Assessment
Air Quality Consultants Ltd 23 Coldharbour Road, Bristol BS6 7JT Tel: 0117 974 1086 12 Airedale Road, London SW12 8SF Tel: 0208 673 4313 [email protected]
Registered Office: 12 St Oswalds Road, Bristol, BS6 7HT Companies House Registration No: 2814570
Document Control
Client Westminster City Council Principal Contact Anju Banga
Report Prepared By: Dr Ben Marner
Document Status and Review Schedule
Report No. Date Status Reviewed by
J2451/2/F1 2 March 2016 Final Stephen Moorcroft (Director)
This report has been prepared by Air Quality Consultants Ltd on behalf of the Client, taking into account the agreed scope of works.
Unless otherwise agreed, this document and all other Intellectual Property Rights remain the property of Air Quality Consultants
Ltd.
In preparing this report, Air Quality Consultants Ltd has exercised all reasonable skill and care, taking into account the objectives
and the agreed scope of works. Air Quality Consultants Ltd does not accept any liability in negligence for any matters arising
outside of the agreed scope of works. The Company operates a formal Quality Management System, which is certified to ISO
9001:2008, and a formal Environmental Management System, certified to ISO 14001:2004. QMF 08.
When issued in electronic format, Air Quality Consultants Ltd does not accept any responsibility for any unauthorised changes
made by others.
When printed by Air Quality Consultants Ltd, this report will be on Evolve Office, 100% Recycled paper.
Job Number J2451
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 1 of 55 March 2016
Executive Summary
The air quality impacts associated with the proposed 2-way system on Baker Street and
Gloucester Place in Westminster have been assessed.
Existing air quality conditions have been described using the results of monitoring carried out by
Defra and Westminster Council, and detailed baseline dispersion modelling. The operational
impacts have been assessed using detailed dispersion modelling. Concentrations of the key air
pollutants associated with road traffic, i.e. nitrogen dioxide and fine particulate matter (PM10 and
PM2.5), have been determined with and without the Scheme. The predicted concentrations have
been compared with air quality objectives set by the Government to protect human health.
Existing conditions within the study area show poor air quality, with nitrogen dioxide concentrations
well above the air quality objectives. The site lies within an Air Quality Management Area.
The annual mean nitrogen dioxide objective is predicted to be exceeded at all receptors without or
with the Scheme, but the Scheme will reduce the number of receptors where exceedences of the
1-hour mean nitrogen dioxide objective are predicted.
The Scheme will improve air quality in some locations but worsen it in others. The number of
receptors where benefits are predicted is almost twenty times the number where adverse impacts
are predicted. With specific regard to residential properties, a substantially greater number of
properties (up to 190 times more) will experience benefits than disbenefits as a result of the
Scheme.
Balancing the predicted benefits of the Scheme with the predicted disbenefits, it is considered that
the Scheme will have a significant beneficial air quality impact.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 2 of 55 March 2016
Contents
1 Introduction ....................................................................................................... 4
2 Scope ................................................................................................................ 5
3 Policy Context and Assessment Criteria ............................................................ 7
4 Assessment Approach .................................................................................... 10
5 Baseline Conditions......................................................................................... 18
6 Impact Assessment ......................................................................................... 23
7 Conclusions .................................................................................................... 27
8 References ...................................................................................................... 28
9 Glossary .......................................................................................................... 29
10 Appendices ..................................................................................................... 31
A1 Extracts from the Mayor’s Air Quality Strategy, and Description of the Low Emission Zones (LEZs) ................................................................................... 32
A2 EPUK & IAQM Planning for Air Quality Guidance ............................................ 34
A3 Professional Experience .................................................................................. 37
A4 Modelling Methodology ................................................................................... 38
A5 Adjustment of Short-Term Data to Annual Mean ............................................. 48
A6 Predicted Concentrations ................................................................................ 49
Tables
Table 1: Air Quality Criteria for Nitrogen Dioxide, PM10 and PM2.5 ................................... 9
Table 2: Summary of Nitrogen Dioxide (NO2) Monitoring (2009-2014) a ........................ 18
Table 3: Summary of PM10 and PM2.5 Automatic Monitoring (2009-2014) a ................... 20
Table 4: Estimated Annual Mean Background Pollutant Concentrations in 2014 and 2018 ................................................................................................................ 21
Table 5: Number of Receptors Classified into Each of the IAQM Descriptors for Annual Mean Impacts.................................................................................................. 24
Table 6: Numbers of Residential Properties Predicted to be Affected by the Scheme a . 25
Table 7: Impacts of the Proposed Scheme on Annual Mean Concentrations at the Automatic Monitoring Sites (µg/m3) a ............................................................... 26
Table A2.1: Air Quality Impact Descriptors for Individual Receptors for All Pollutants a 35
Table A4.1: Summary of Adjustments Made to Emission Factor Toolkit ....................... 39
Table A5.1: Data used to Adjust Monitoring Data at the Oxford Street Monitor ............. 48
Table A6.1: Dispersion Model Results a ........................................................................ 49
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 3 of 55 March 2016
Figures
Figure 1: Roads Included in Dispersion Model ................................................................. 6
Figure 2: Locations of all Receptors to the North of Marylebone Road (Receptors 1 to 64) 12
Figure 3: Locations of all Receptors between Marylebone Road and George Street (Receptors 65 to 213) ...................................................................................... 13
Figure 4: Locations of all Receptors on and to the South of George Street (Receptors 214 to 334) ............................................................................................................. 14
Figure 5: Monitoring Locations ....................................................................................... 19
Figure A4.1: Excerpt from Modelled Road Network (See Figure 1 for full network). ...... 40
Figure A4.2: Urban Background Monitors used to Calibrate Defra’s Background Maps 41
Figure A4.3: Comparison of Measured and Estimated Background- Annual Mean Nitrogen Dioxide Concentrations at all Three Urban Background Automatic Monitoring Sites in 2014 (µg/m3) ..................................................................... 42
Figure A4.4: Comparison of Measured and Estimated Background Annual Mean PM10 Concentrations at all Three Urban Background Automatic Monitoring Sites in 2014 (µg/m3) ................................................................................................... 42
Figure A4.5: Comparison of Measured Road NOx to Unadjusted Modelled Road NOx Concentrations. The dashed lines show ± 25%. ............................................. 44
Figure A4.6: Comparison of Measured Total NO2 to Final Adjusted Modelled Total NO2 Concentrations. The dashed lines show ± 25%. ............................................. 45
Figure A4.7: Hourly Mean Nitrogen Oxides vs Nitrogen Dioxide at Marylebone Road and Oxford Street in 2014 (µg/m3) (also showing best-fit relationship) ................... 47
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 4 of 55 March 2016
1 Introduction
1.1 This report considers the air quality impacts associated with the proposed revision to highways on
and around Baker Street and Gloucester Place in Westminster (the ‘Scheme’). The assessment
has been carried out by Air Quality Consultants Ltd on behalf of Westminster City Council.
1.2 Baker Street and Gloucester Place currently carry 1-way traffic, with Baker Street being
southbound and Gloucester Place being northbound. The proposed Scheme involves allowing
traffic on both roads to travel in either direction. It will also involve numerous associated
amendments to junctions, new pedestrian footways, and public realm improvements.
1.3 This report describes the impacts of these changes on ambient air quality.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 5 of 55 March 2016
2 Scope
2.1 The assessment covers the operational impacts of the proposed Scheme on ambient
concentrations of nitrogen dioxide, PM10 and PM2.5, as these are the pollutants of principal concern
in relation to road traffic emissions.
Spatial Scope
2.2 The study area for the assessment is that of the micro-simulation traffic model that was used to
assess the impacts of the Scheme. The roads included in the dispersion model are shown in
Figure 1.
Temporal Scope
2.3 The report describes existing, local air quality conditions (2014), and the predicted air quality in the
future assuming that the proposed development does, or does not proceed. The assessment
focuses on 2018, which is the first complete calendar year in which the Scheme could become
operational.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 6 of 55 March 2016
Figure 1: Roads Included in Dispersion Model
Contains Ordnance Survey data © Crown copyright and database right 2016
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 7 of 55 March 2016
3 Policy Context and Assessment Criteria
The UK Air Quality Strategy
3.1 The Air Quality Strategy published by the Department for Environment, Food, and Rural Affairs
(Defra) provides the policy framework (Defra, 2007) for air quality management and assessment in
the UK. It provides air quality standards and objectives for key air pollutants, which are designed
to protect human health and the environment. It also sets out how the different sectors: industry,
transport and local government, can contribute to achieving the air quality objectives. Local
authorities are seen to play a particularly important role. The strategy describes the Local Air
Quality Management (LAQM) regime that has been established, whereby every authority has to
carry out regular reviews and assessments of air quality in its area to identify whether the
objectives have been, or will be, achieved at relevant locations, by the applicable date. If this is
not the case, the authority must declare an Air Quality Management Area (AQMA), and prepare an
action plan which identifies appropriate measures that will be introduced in pursuit of the
objectives.
The London Mayor’s Air Quality Strategy
3.2 The revised Mayor’s Air Quality Strategy (MAQS) was published in December 2010 (GLA, 2010).
The overarching aim of the Strategy is to reduce pollution concentrations in London to achieve
compliance with the EU limit values as soon as possible. The Strategy commits to the continuation
of measures identified in the 2002 MAQS, and sets out a series of additional measures. These
additional measures and the role of the Low Emission Zone are described in Appendix A1
Assessment Criteria
Health Criteria
3.3 The Government has established a set of air quality standards and objectives to protect human
health. The ‘standards’ are set as concentrations below which effects are unlikely even in
sensitive population groups, or below which risks to public health would be exceedingly small.
They are based purely upon the scientific and medical evidence of the effects of an individual
pollutant. The ‘objectives’ set out the extent to which the Government expects the standards to be
achieved by a certain date. They take account of economic efficiency, practicability, technical
feasibility and timescale. The objectives for use by local authorities are prescribed within the Air
Quality (England) Regulations, 2000, Statutory Instrument 928 (2000) and the Air Quality
(England) (Amendment) Regulations 2002, Statutory Instrument 3043 (2002).
3.4 The objectives for nitrogen dioxide and PM10 were to have been achieved by 2005 and 2004
respectively, and continue to apply in all future years thereafter. The PM2.5 objective is to be
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 8 of 55 March 2016
achieved by 2020. Measurements across the UK have shown that the 24-hour PM10 objective
could be exceeded where the annual mean concentration is above 32 g/m3 (Defra, 2009). The
predicted annual mean PM10 concentrations are thus used as a proxy to determine the likelihood of
an exceedence of the 24-hour mean PM10 objective. Where predicted annual mean
concentrations are below 32 µg/m3 it is unlikely that the 24-hour mean objective will be exceeded.
3.5 The objectives apply at locations where members of the public are likely to be regularly present
and are likely to be exposed over the averaging period of the objective. Defra explains where
these objectives will apply in its Local Air Quality Management Technical Guidance (Defra, 2009).
The annual mean objectives for nitrogen dioxide and PM10 are considered to apply at the façades
of residential properties, schools, hospitals etc.; they do not apply at hotels. The 24-hour objective
for PM10 is considered to apply at the same locations as the annual mean objective, as well as in
gardens of residential properties and at hotels. The 1-hour mean objective for nitrogen dioxide
applies wherever members of the public might regularly spend 1-hour or more, including outdoor
eating locations and pavements of busy shopping streets.
3.6 The 1-hour mean objective for nitrogen dioxide allows no more than 18 exceedences of 200 µg/m3
as a 1-hour mean concentration in a year. For a complete year of data, the 19th highest hour
equates to the 99.79th percentile. It is thus common practice to predict 99.79
th percentiles of 1-
hour mean nitrogen dioxide concentrations and compare these directly against the 200 µg/m3
standard.
3.7 The European Union has also set limit values for nitrogen dioxide, PM10 and PM2.5. The limit
values for nitrogen dioxide are the same numerical concentrations as the UK objectives, but
achievement of these values is a national obligation rather than a local one (Directive 2008/50/EC
of the European Parliament and of the Council, 2008). In the UK, only monitoring and modelling
carried out by UK Central Government meets the specification required to assess compliance with
the limit values. Central Government does not recognise local authority monitoring or local
modelling studies when determining the likelihood of the limit values being exceeded.
3.8 The relevant air quality criteria for this assessment are provided in Table 1.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 9 of 55 March 2016
Table 1: Air Quality Criteria for Nitrogen Dioxide, PM10 and PM2.5
Pollutant Time Period Objective
Nitrogen Dioxide
1-hour Mean 200 g/m3 not to be exceeded more than 18 times a year
Annual Mean 40 g/m3
Fine Particles (PM10)
24-hour Mean 50 g/m3 not to be exceeded more than 35 times a year
Annual Mean 40 g/m3 a
Fine Particles (PM2.5)
b
Annual Mean 25 µg/m3
a A proxy value of 32 g/m
3 as an annual mean is used in this assessment to assess the likelihood of the
24-hour mean PM10 objective being exceeded. Measurements have shown that, above this
concentration, exceedences of the 24-hour mean PM10 objective are possible (Defra, 2009).
b The PM2.5 objective, which is to be met by 2020, is not in Regulations and there is no requirement for
local authorities to meet it.
Descriptors for Air Quality Impacts and Assessment of Significance
3.9 There is no official guidance in the UK in relation to development control on how to describe air
quality impacts, nor how to assess their significance. The approach developed jointly by
Environmental Protection UK (EPUK) and the Institute of Air Quality Management (IAQM)1 (EPUK
& IAQM, 2015) has therefore been used. This includes defining descriptors of the impacts at
individual receptors, which take account of the percentage change in concentrations relative to the
relevant air quality objective, rounded to the nearest whole number, and the absolute concentration
relative to the objective. The overall significance of the air quality impacts is determined using
professional judgement, taking account of the impact descriptors. Full details of the EPUK/IAQM
approach are provided in Appendix A2. The approach includes elements of professional
judgement, and the experience of the consultants preparing the report is set out in Appendix A3.
1 The IAQM is the professional body for air quality practitioners in the UK.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 10 of 55 March 2016
4 Assessment Approach
Existing Conditions
4.1 Information on existing air quality has been obtained by collating the results of monitoring carried
out by Defra and Westminster Council. There are two monitoring sites within the study area; one
on Marylebone Road and one on Oxford Street. Three further monitoring sites which are outside
of the study area have been used to determine background concentrations away from roads. The
background concentrations in the study area have also been defined using the national pollution
maps published by (Defra, 2016). These cover the whole country on a 1x1 km grid. Further details
of the approach taken to deriving background concentrations are given in Appendix A4.
4.2 Current exceedences of the annual mean EU limit value for nitrogen dioxide have been identified
using the results from the Marylebone Road monitor, which operates to EU data quality standards,
and which Defra uses to report exceedences of the limit value to the European Commission.
Sensitive Locations
4.3 Concentrations have been predicted at 334 receptors, which represent the roadside façades of
those buildings where the highest concentrations are expected. When selecting these receptors,
particular attention has been paid to assessing impacts close to junctions. Receptors have all
been modelled at a height of 1.5 m. The receptors are shown in Figure 2, Figure 3, and Figure 4.
4.4 It should be recognised that the receptors do not specifically represent locations where either the
long-term or short-term objectives apply. At many of the receptors, there is no residential
exposure and the predicted concentrations will be higher than those at the nearest residential
property. Conversely, there may be relevant exposure to the 1-hour mean nitrogen dioxide
objective closer to roads than where the receptors are located2, and thus short-term impacts may
be under-predicted. The selected receptors, nevertheless, provide a reasonable indication of the
overall impacts of the Scheme on local air quality.
4.5 Concentrations have also been predicted at the monitoring sites on Marylebone Road and Oxford
Street. This has allowed the model to be verified (see Appendix A4) and for the impact of the
Scheme on the EU limit values to be determined.
4.6 Finally, concentrations have been predicted at 7,180 receptors which represent all residential
properties within the study area. These receptors were provided by Westminster Council from
electoral role information. They were positioned within each building footprint and not at the
roadside façades. Furthermore, all addresses were modelled at a height of 1.5 m regardless of the
2 The receptors are on the façades of buildings, but the 1-hour mean nitrogen dioxide objective can apply on
pavements and where there is outdoor seating.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 11 of 55 March 2016
number of apartments within each building. The results from these receptors have been used to
compare the total number of addresses where benefits and disbenefits are predicted and any
inaccuracy in precise receptor positioning is only of minor concern.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 12 of 55 March 2016
Figure 2: Locations of all Receptors to the North of Marylebone Road (Receptors 1 to 64) Contains Ordnance Survey data © Crown copyright and database right 2016. Additional data sourced from third parties, including public sector information licensed under the Open Government Licence v1.0.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 13 of 55 March 2016
Figure 3: Locations of all Receptors between Marylebone Road and George Street (Receptors 65 to 213) Contains Ordnance Survey data © Crown copyright and database right 2016. Additional data sourced from third parties, including public sector information licensed under the Open Government Licence v1.0.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 14 of 55 March 2016
Figure 4: Locations of all Receptors on and to the South of George Street (Receptors 214 to 334) Contains Ordnance Survey data © Crown copyright and database right 2016. Additional data sourced from third parties, including public sector information licensed under the Open Government Licence v1.0.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 15 of 55 March 2016
Assessment Scenarios
4.7 Predicted concentrations of nitrogen dioxide, PM10 and PM2.5 have been carried out for 2018,
assuming both that the development does proceed (With Scheme), and does not proceed (Without
Scheme). In addition to the set of ‘official’ predictions, a sensitivity test has been carried out for
nitrogen dioxide that involves assuming much higher nitrogen oxides emissions from certain
vehicles than have been predicted by Defra. This is to address the potential under-performance of
emissions control technology on modern diesel vehicles (AQC, 2016a).
4.8 Concentrations at the monitoring sites have also been predicted for 2014 to allow the model to be
verified against measurements.
Modelling Methodology
4.9 Norman Rourke Pryme provided detailed information on traffic flows (by vehicle type) and speeds
for each of the key vehicle lanes and turning movements across the study area. These covered
the morning peak hour, the evening peak hour, and the inter-peak period. Norman Rourke Pryme
derived these data by combining the absolute flows predicted by the SATURN model with the
speeds and proportional turning movements predicted by the VISIM model. Norman Rourke
Pryme also provided a set of factors to predict off-peak flows and annual average flows. The latter
were used to calculate average weekend flows. The traffic data provided were for 2017 Without
Scheme and 2017 With Scheme. The 2017 Without Scheme data were used to represent
conditions both in 2014 and in 2018. The 2017 With Scheme data were used to represent
conditions in 2018.
4.10 The predicted hourly-mean flows and speeds for each vehicle class were entered into Defra’s
Emissions Factor Toolkit (EFT V6.02) to calculate hourly average vehicle-type-specific emissions
of nitrogen oxides, PM10 and PM2.5. These were then collated as a set of diurnal and weekly
emissions profiles. The same approach was then carried out using AQC’s emissions calculator
for the nitrogen oxides emissions sensitivity test as described in Paragraph A4.5 in Appendix A4.
4.11 Dispersion modelling was carried out using the ADMS-Roads model. Because more than 1,000
links, each with an individual set of diurnal emissions profiles were modelled, it was necessary to
split the network up across several separate model runs.
4.12 Further details of the modelling methodology are given in Appendix A4.
Uncertainty
4.13 There are many components that contribute to the uncertainty of modelling predictions. The
dispersion model used in this assessment is dependent upon the traffic data that have been input,
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 16 of 55 March 2016
which will have inherent uncertainties associated with them. There are then additional
uncertainties, as models are required to simplify real-world conditions into a series of algorithms.
4.14 An important stage in the process is model verification, which involves comparing the model output
with measured concentrations (see Appendix A4). The level of confidence in the verification
process is necessarily enhanced when data from an automatic analyser have been used, as has
been the case for this assessment (see Appendix A4). Because the model has been verified and
adjusted, there can be reasonable confidence in the prediction of current year (2014)
concentrations.
4.15 Predicting pollutant concentrations in a future year will always be subject to greater uncertainty.
For obvious reasons, the model cannot be verified in the future, and it is necessary to rely on a
series of projections provided by DfT and Defra as to what will happen to traffic volumes,
background pollutant concentrations and vehicle emissions.
4.16 Historically, large reductions in nitrogen oxides emissions have been projected, which has led to
significant reductions in nitrogen dioxide concentrations from one year to the next being predicted.
Over time, it was found that trends in measured concentrations did not reflect the rapid reductions
that Defra and DfT had predicted (Carslaw et al., 2011). This was evident across the UK, although
the effect appeared to be greatest in inner London; there was also considerable inter-site variation.
Emission projections over the 6 to 8 years prior to 2009 suggested that both annual mean nitrogen
oxides and nitrogen dioxide concentrations should have fallen by around 15-25%, whereas
monitoring data showed that concentrations remained relatively stable, or even showed a slight
increase. Analysis of more recent data for 23 roadside sites in London covering the period 2003 to
2012 showed a weak downward trend of around 5% over the ten years (Carslaw and Rhys-Tyler,
2013), but this still falls short of the improvements that had been predicted at the start of this
period.
4.17 The reason for the disparity between the expected concentrations and those measured relates to
the on-road performance of modern diesel vehicles. New vehicles registered in the UK have had
to meet progressively tighter European type approval emissions categories, referred to as "Euro"
standards. While the nitrogen oxides emissions from newer vehicles should be lower than those
from equivalent older vehicles, the on-road performance of some modern diesel vehicles has often
been no better than that of earlier models. This has been compounded by an increasing
proportion of nitrogen dioxide in the nitrogen oxides emissions, i.e. primary nitrogen dioxide, which
has a significant effect on roadside concentrations (Carslaw et al., 2011) (Carslaw and Rhys-Tyler,
2013).
4.18 A detailed analysis of emissions from modern diesel vehicles has been carried out (AQC, 2016a).
This shows that, where previous standards had limited on-road success, the ‘Euro VI’ and ‘Euro 6’
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 17 of 55 March 2016
standards that new vehicles have had to comply with from 2013/163 are delivering real on-road
improvements. A detailed comparison of the predictions in Defra’s latest Emission Factor Toolkit
(EFT v6.0.2) against the results from on-road emissions tests has shown that Defra’s latest
predictions still have the potential to under-predict emissions from some vehicles, albeit by less
than has historically been the case (AQC, 2016a). In order to account for this potential under-
prediction, a sensitivity test has been carried out in which the emissions from Euro IV, Euro V,
Euro VI, and Euro 6 vehicles have been uplifted as described in Paragraph A4.5 in Appendix A4.
The results from this sensitivity test are likely to over-predict emissions from vehicles in the future
(AQC, 2016a) and thus provide a reasonable worst-case upper-bound to the assessment.
3 Euro VI refers to heavy duty vehicles, while Euro 6 refers to light duty vehicles. The timings for meeting the
standards vary with vehicle type and whether the vehicle is a new model or existing model.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 18 of 55 March 2016
5 Baseline Conditions
Air Quality Review and Assessment
5.1 The City of Westminster Council has investigated air quality within its area as part of its
responsibilities under the LAQM regime. In 1999 the Council declared an AQMA covering the
entire borough for exceedences of the nitrogen dioxide and PM10 objectives.
Local Air Quality Monitoring
5.2 There are two automatic air quality monitors within the study area, one at Marylebone Road, and
one at Oxford Street. Results for the years 2009 to 2014 are summarised in Table 2 and the
monitoring locations are shown in Figure 5.
Table 2: Summary of Nitrogen Dioxide (NO2) Monitoring (2009-2014) a
Site No. Location 2009 2010 2011 2012 2013 2014
Annual Mean (µg/m3)
MY1 Marylebone Road 107 98 97 94 85 94
WM6 Oxford Street - - - - - b 141
b,c
Objective 40
No. of Hours > 200 µg/m3
MY1 Marylebone Road 469 524 217 122 59 60
WM6 Oxford Street - - - - 1,502 d 1,532
d
Objective 18
a Data downloaded from the London Air website (King's College London, 2016). Exceedences of the
objectives are shown in bold
b Poor data capture.
c Data annualised as shown in Appendix A5.
d Poor data capture and the number of exceedences from a full year of data may have been higher.
5.3 Measured nitrogen dioxide concentrations in this area are very high and both the annual mean and
1-hour mean objectives have been exceeded by a considerable margin during all years of
measurement. The number of 1-hour mean exceedences has fallen significantly at the
Marylebone Road site over the last six years, but this is not reflected in the annual mean
concentration. The absence of any downward trend in the annual mean measurements contrasts
with the expected decline due to the progressive introduction of new vehicles operating to more
stringent standards (the implications of this are discussed in Section 4 of this report).
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 19 of 55 March 2016
Figure 5: Monitoring Locations
Contains Ordnance Survey data © Crown copyright and database right 2016
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 20 of 55 March 2016
5.4 The Marylebone Road and Oxford Street monitors also measure concentrations of PM10, although
data capture at Oxford Street has been poor over recent years. The Marylebone Road site also
measures PM2.5. Data for 2009-2014 are presented in Table 3. Concentrations have been below
the level of the objectives in each year except 2009 and 2011 at Marylebone Road, when the 24-
hour mean objective was exceeded. Measured PM2.5 concentrations have been below the level of
the objective each year.
Table 3: Summary of PM10 and PM2.5 Automatic Monitoring (2009-2014) a
Site No. Location 2009 2010 2011 2012 2013 2014
PM10 Annual Mean (µg/m3)
MY1 Marylebone Road 37 32 38 - 29 26
WM6 Oxford Street - - 30 - - -
Objective 40
PM10 No. Days >50 µg/m3
MY1 Marylebone Road 43 23 57 - 21 14
WM6 Oxford Street - - 23 - - -
Objective 35
PM2.5 Annual Mean (µg/m3)
MY1 Marylebone Road 21 - 16 21 20 18
Objective 25
a All data from FDMS-TEOM monitors. PM10 data downloaded from the London Air website (King's
College London, 2016). PM2.5 data downloaded from Defra’s UK-Air website (Defra, 2016). Objective
exceedences shown in bold.
Exceedences of EU Limit Value
5.5 The Marylebone Road monitor is part of Defra’s AURN network, the results of which are used to
report exceedences of the limit values to the EC. It is one of several sites across the Greater
London Urban Area that has measured exceedences of the nitrogen dioxide limit values. The
Greater London Urban Area has thus been reported to the EC as exceeding the limit value for
annual mean nitrogen dioxide concentrations. Defra has not measured or predicted any recent
exceedences of the PM10 or PM2.5 limit values anywhere in London.
Background Concentrations
5.6 In addition to these locally measured concentrations, estimated background concentrations in the
study area have been determined for 2014 and 2018. Table 4 shows the range of predicted
background concentrations across the study area. The background concentrations have been
derived as described in Appendix A4. The background concentrations for PM10 and PM2.5 are all
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 21 of 55 March 2016
below the objectives. Some of the background concentrations for nitrogen dioxide are below the
objective while others are above the objective.
Table 4: Estimated Annual Mean Background Pollutant Concentrations in 2014 and 2018
Year NO2 PM10 PM2.5
2014 38.7 – 50.8 16.6 – 18.6 11.4 – 12.6
2018 a 33.3 – 43.6 15.9 – 17.7 10.7 – 11.8
2018 Worst-case Sensitivity Test b 34.7 – 45.5 - -
Objectives 40 40 25 b
n/a = not applicable. The range of values is for the different 1x1 km grid squares covering the study area.
a In line with Defra’s forecasts
b Assuming higher emissions from modern diesel vehicles as described in Appendix A4.
c The PM2.5 objective, which is to be met by 2020, is not in Regulations and there is no requirement for
local authorities to meet it.
Baseline Dispersion Model Results
5.7 Baseline concentrations of nitrogen dioxide, PM10 and PM2.5 have been modelled at each receptor
(see Figure 2 to Figure 4). The results for all 334 receptors in 2018 without the Scheme are set
out in Table A6.1 in Appendix A6. The predictions for nitrogen dioxide include a sensitivity test
which accounts for the potential under-performance of emissions control technology on modern
diesel vehicles. In addition, the modelled road components of nitrogen oxides have been
increased from those predicted by the model based on a comparison with local measurements
(see Appendix A4).
5.8 Annual mean nitrogen dioxide concentrations in 2018 are predicted to range from 45 µg/m3
to 103 µg/m3. All of the predicted concentrations thus exceed the 40 µg/m
3 objective. The lowest
predicted concentration is at Receptor 34 (Linhope Street), while the highest is at Receptor 57
(junction of Marylebone Road and Gloucester Place). The 99.79th percentiles of 1-hour mean
nitrogen dioxide concentrations range from 100 µg/m3 to 270 µg/m
3. The lowest predicted
concentration is at Receptor 280 (Manchester Square), while the highest is at Receptor 67 (corner
of Marylebone Road and Baker Street)4. In total, the 1-hour objective of 200 µg/m3 (as the 99.79
th
percentile) is predicted to be exceeded at 48 out of the 334 receptors, without the Scheme. All of
these predicted concentrations represent roadside receptors. At locations further from roads,
4 The reason why the maxima and minima of annual mean and 1-hour mean concentrations are not co-located
relates to differences in the diurnal emissions profiles on different roads, and differences in the background concentration fields (spatial variation in background concentrations across the study area has been included in the annual mean modelling but not in the 1-hour mean modelling – see Appendix A4).
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 22 of 55 March 2016
concentrations will be lower. Well away from roads, concentrations will approach the background
levels set out in Table 4.
5.9 Concentrations of PM10 are predicted to range from 17 to 24 µg/m3, all below the 40 µg/m
3
objective. Furthermore, all of the predicted annual mean PM10 concentrations are below 32 µg/m3,
making it unlikely that the 24-hour mean PM10 objective was exceeded. The predicted PM2.5
concentrations range from 11 µg/m3 to 16 µg/m
3, all below the 25 µg/m
3 objective.
Worst-case Sensitivity Test for Nitrogen Dioxide
5.10 The results from the upper-bound sensitivity test show slightly higher levels, with annual mean
concentrations of nitrogen dioxide predicted to range from 47 µg/m3 to 109 µg/m
3, while the 99.79
th
percentiles of 1-hour mean nitrogen dioxide concentrations are predicted to range from 103 µg/m3
to 287 µg/m3.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 23 of 55 March 2016
6 Impact Assessment
6.1 Predicted concentrations of nitrogen dioxide, PM10 and PM2.5 for all receptors are set out in
Table A6.1 in Appendix A6. These tables also describe the annual mean impacts at each receptor
using the impact descriptors given in Appendix A2. For nitrogen dioxide, results are presented for
two scenarios to account for the potential under-performance of emissions control technology on
modern diesel vehicles.
Nitrogen Dioxide
6.2 The annual mean nitrogen dioxide objective is predicted to be exceeded at all receptors, with or
without the Scheme. Changes range from a 16% reduction to a 14% increase in annual mean
concentrations. The impacts have been described following the approach recommended by
EPUK/IAQM, and these results are summarised in Table 5. Substantial beneficial or moderate
beneficial impacts are predicted at 307 receptors. Substantial adverse or moderate adverse
impacts are predicted at just 16 receptors.
6.3 The EPUKIAQM guidance does not provide descriptors for road-traffic impacts on total 1-hour
mean nitrogen dioxide concentrations, but the Scheme is predicted to increase the 99.79th
percentiles of 1-hour mean concentrations at 37 receptors and reduce them at 297 receptors.
Furthermore, the Scheme is predicted to reduce the number of receptors where the 1-hour mean
nitrogen dioxide objective is exceeded from 48 receptors to 39 receptors.
Worst-case Sensitivity Test
6.4 The worst-case sensitivity test for nitrogen dioxide predicts slightly higher concentrations at most
receptors, both without and with the Scheme. In this case, the number of receptors where
moderate or substantial beneficial impacts are predicted increases to 313 (from 307) while the
number of receptors with moderate or substantial adverse impacts increases to 17 (from 16)
(Table 5).
6.5 In terms of 1-hour mean nitrogen dioxide concentrations, 288 receptors are predicted to
experience benefits, while 46 receptors are predicted to experience disbenefits. The numbers of
receptors where exceedences of the 1-hour mean objective are predicted are 62 Without Scheme
and 49 With Scheme5.
5 i.e. the benefits of the Scheme are more pronounced in the worst-case emissions sensitivity test in which total
predicted concentrations are higher.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 24 of 55 March 2016
PM10 and PM2.5
6.6 The predicted concentrations of PM10 and PM2.5 are below the annual mean objectives at all
receptors, with or without the Scheme. Furthermore, as the annual mean PM10 concentrations are
below 32 µg/m3, it is unlikely that the 24-hour mean PM10 objective will be exceeded at any of the
receptors. Table 5 shows that all of the impacts are described as negligible, with the exception of
two receptors where slight adverse impacts are predicted. These are Receptors 105 and 106
(which are both on the corner of Baker Street and Crawford Street).
Table 5: Number of Receptors Classified into Each of the IAQM Descriptors for Annual Mean Impacts
Impact Descriptor
‘Official’ Nitrogen Dioxide
Predictions a
Worst-case Sensitivity
Test for Nitrogen Dioxide
b
PM10 PM2.5
Substantial Beneficial 291 297 0 0
Moderate Beneficial 16 16 0 0
Slight Beneficial 0 0 0 0
Negligible 11 4 332 332
Slight Adverse 0 0 2 2
Moderate Adverse 4 4 0 0
Substantial Adverse 12 13 0 0
a In line with Defra’s forecasts.
b Assuming higher emissions from modern diesel vehicles as described in Paragraph A4.5.
Overall Local Air Quality Impacts
6.7 As explained in Paragraph 4.6, annual mean concentrations have also been predicted for all 7,180
residential properties within the study area. The results are summarised in Table 6. It should be
noted that all predicted changes have been counted, regardless of how small they are. In terms of
nitrogen dioxide, more than 7,000 properties will benefit from the Scheme while fewer than 100
properties will experience adverse impacts. For PM10 and PM2.5, almost 7,000 properties will
benefit while fewer than 500 properties will experience adverse impacts. The objectives for PM10
and PM2.5 will continue to be achieved across the study area either with or without the Scheme.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 25 of 55 March 2016
Table 6: Numbers of Residential Properties Predicted to be Affected by the Scheme a
Pollutant Number of Residential
Properties Where Benefits are Predicted
Number of Residential Properties Where
Disbenefits are Predicted
‘Official’ Nitrogen Dioxide Predictions
b 7,143 37
Worst-case Sensitivity Test for Nitrogen Dioxide
c 7,091 89
Annual Mean PM10 6,902 278
Annual Mean PM2.5 6,775 405
a It should be noted that all predicted changes have been counted no matter how small.
b In line with Defra’s forecasts.
c Assuming higher emissions from modern diesel vehicles as described in Paragraph A4.5.
Assessment against the EU Limit Values
6.8 The Marylebone Road monitor is one of the sites used to report exceedences of the limit values to
the EC. Table 7 sets out the predicted impacts of the Scheme on concentrations at both the
Marylebone Road and Oxford Street monitors. Concentrations at the Oxford Street site are not
currently reported to the EC as limit value exceedences, but the results are shown for
completeness.
6.9 The Scheme is predicted to reduce concentrations of all pollutants at both monitoring sites. The
reduction at the Marylebone Road site is predicted to be more than 5 µg/m3. In all recent years,
the Marylebone Road site has measured higher annual mean nitrogen dioxide concentrations than
any of the other sites used by Defra to report exceedences of the limit values to the EC. A
reduction in concentrations at this site thus has the potential to bring forward compliance of the UK
with the Limit Values.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 26 of 55 March 2016
Table 7: Impacts of the Proposed Scheme on Annual Mean Concentrations at the Automatic Monitoring Sites (µg/m
3) a
Pollutant Scenario Marylebone Road Oxford Street Limit Value
‘Official’ Annual Mean NO2
Without Scheme 98.1 87.9 40
With Scheme 92.8 81.4
Change -5.3 -6.5 -
Sensitivity Test Annual Mean NO2
Without Scheme 102.3 97.2 40
With Scheme 97.2 89.3
Change -5.1 -7.9 -
Annual Mean PM10
Without Scheme 24.2 20.8 40
With Scheme 22.5 19.9
Change -1.7 -0.8 -
Annual Mean PM2.5
Without Scheme 16.4 14.1 25
With Scheme 15.0 13.4
Change -1.4 -0.7 -
a exceedences of the limit values shown in bold.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 27 of 55 March 2016
7 Conclusions
7.1 The operational impacts of changed traffic flows and speeds and altered lane positions associated
with the Scheme have been assessed. In the case of nitrogen dioxide, a sensitivity test has also
been carried out which considers the potential under-performance of emissions control technology
on modern diesel vehicles.
7.2 It is concluded that concentrations of PM10 and PM2.5 will remain below the objectives in 2018
whether the Scheme is developed or not. The predicted PM10 and PM2.5 impacts are all negligible
except for at three receptors where slight adverse impacts are predicted.
7.3 Annual mean concentrations of nitrogen dioxide will remain above the objective at all receptors
whether the Scheme is developed or not. Using impact descriptors developed by the IAQM, the
impacts of the Scheme range from substantial beneficial to substantial adverse, but the number of
receptors where benefits are predicted is almost twenty times the number where adverse impacts
are predicted. The Scheme will also reduce the number of receptors where exceedences of the 1-
hour mean nitrogen dioxide objective are predicted.
7.4 Comparing the numbers of residential properties where air quality is predicted to improve with the
number where air quality is predicted to worsen shows that many more (up to 190 times more)
properties will experience benefits than disbenefits as a result of the Scheme.
7.5 The Scheme is predicted to reduce annual mean nitrogen dioxide concentrations at both the
Marylebone Road and Oxford Street air quality monitoring stations by more than 5 µg/m3. This is
important because results from the Marylebone Road monitor are used by Defra when it reports
assessment against the European Limit Values to the European Commission. The Scheme thus
has the potential to bring forward compliance of the UK with the Limit Values.
7.6 Balancing the predicted benefits of the Scheme with the predicted disbenefits, it is considered that,
overall, the Scheme will have a significant beneficial air quality impact.
7.7 The Mayor of London has committed to the implementation of an Ultra-Low Emission Zone (ULEZ)
by September 2020 at the latest. Parts of the study area will fall within this ULEZ. The effects of
the ULEZ in reducing pollutant concentrations in central London has not been accounted for in this
assessment.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 28 of 55 March 2016
8 References
AQC (2016a) Emissions of Nitrogen Oxides from Modern Diesel Vehicles , [Online],
Available: http://www.aqconsultants.co.uk/Resources/Download-Reports.aspx.
AQC (2016b) Deriving Background Concentrations of NOx and NO2, [Online], Available:
http://www.aqconsultants.co.uk/Resources/Download-Reports.aspx.
Carslaw, D., Beevers, S., Westmoreland, E. and Williams, M. (2011) Trends in NOx and
NO2 emissions and ambient measurements in the UK, [Online], Available: uk-
air.defra.gov.uk/reports/cat05/1108251149_110718_AQ0724_Final_report.pdf.
Carslaw, D. and Rhys-Tyler, G. (2013) Remote sensing of NO2 exhaust emissions from
road vehicles, July, [Online], Available: http://uk-
air.defra.gov.uk/assets/documents/reports/cat05/1307161149_130715_DefraRemoteSensi
ngReport_Final.pdf.
Defra (2007) The Air Quality Strategy for England, Scotland, Wales and Northern Ireland,
Defra.
Defra (2009) Review & Assessment: Technical Guidance LAQM.TG(09), Defra.
Defra (2016) Defra Air Quality Website, [Online], Available: http://laqm.defra.gov.uk/.
Directive 2008/50/EC of the European Parliament and of the Council (2008).
EPUK & IAQM (2015) Land-Use Planning & Development Control: Planning For Air
Quality, IAQM.
GLA (2010) Mayor's Air Quality Strategy: Cleaning the Air.
King's College London (2016) London Air.
The Air Quality (England) (Amendment) Regulations, 2002, Statutory Instrument 3043
(2002), HMSO.
The Air Quality (England) Regulations, 2000, Statutory Instrument 928 (2000), HMSO.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 29 of 55 March 2016
9 Glossary
ADMS-Roads Atmospheric Dispersion Modelling System model for Roads
AQC Air Quality Consultants
AQMA Air Quality Management Area
AURN Automatic Urban and Rural Network
DCLG Department for Communities and Local Government
Defra Department for Environment, Food and Rural Affairs
DfT Department for Transport
EFT Emission Factor Toolkit
EPUK Environmental Protection UK
Exceedence A period of time when the concentration of a pollutant is greater than the
appropriate air quality objective. This applies to specified locations with relevant
exposure
FDMS Filter Dynamics Measurement System
HDV Heavy Duty Vehicles (> 3.5 tonnes)
HGV Heavy Goods Vehicle
IAQM Institute of Air Quality Management
LAQM Local Air Quality Management
LDF Local Development Framework
LDV Light Duty Vehicles (<3.5 tonnes)
LEZ Low Emission Zone
μg/m3 Microgrammes per cubic metre
MAQS Mayor’s Air Quality Strategy
NO Nitric oxide
NO2 Nitrogen dioxide
NOx Nitrogen oxides (taken to be NO2 + NO)
NPPF National Planning Policy Framework
Objectives A nationally defined set of health-based concentrations for nine pollutants, seven of
which are incorporated in Regulations, setting out the extent to which the
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 30 of 55 March 2016
standards should be achieved by a defined date. There are also vegetation-based
objectives for sulphur dioxide and nitrogen oxides
PHV Private Hire Vehicle
PM10 Small airborne particles, more specifically particulate matter less than 10
micrometres in aerodynamic diameter
PM2.5 Small airborne particles less than 2.5 micrometres in aerodynamic diameter
Standards A nationally defined set of concentrations for nine pollutants below which health
effects do not occur or are minimal
TEOM Tapered Element Oscillating Microbalance
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 31 of 55 March 2016
10 Appendices
A1 Extracts from the Mayor’s Air Quality Strategy, and Description of the Low Emission Zones (LEZs) ................................................................................... 32
A2 EPUK & IAQM Planning for Air Quality Guidance ............................................ 34
A3 Professional Experience .................................................................................. 37
A4 Modelling Methodology ................................................................................... 38
A5 Adjustment of Short-Term Data to Annual Mean ............................................. 48
A6 Predicted Concentrations ................................................................................ 49
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 32 of 55 March 2016
A1 Extracts from the Mayor’s Air Quality Strategy, and Description of the Low Emission Zones (LEZs)
The Mayor’s Air Quality Strategy
A1.1 The Mayor’s Air Quality Strategy commits to the continuation of measures identified in the 2002
MAQS, and sets out a series of additional measures, including:
Policy 1 – Encouraging smarter choices and sustainable travel;
Measures to reduce emissions from idling vehicles focusing on buses, taxis, coaches, taxis, PHVs
and delivery vehicles;
Using spatial planning powers to support a shift to public transport;
Supporting car free developments.
Policy 2 – Promoting technological change and cleaner vehicles:
Supporting the uptake of cleaner vehicles.
Policy 4 – Reducing emissions from public transport:
Introducing age limits for taxis and PHVs.
Policy 5 – Schemes that control emissions to air:
Implementing Phases 3 and 4 of the LEZ from January 2012
Introducing a NOx emissions standard (Euro IV) into the LEZ for Heavy Goods Vehicles (HGVs),
buses and coaches, from 2015.
Policy 7 – Using the planning process to improve air quality:
Minimising increased exposure to poor air quality, particularly within AQMAs or where a
development is likely to be used by a large number of people who are particularly vulnerable to air
quality;
Ensuring air quality benefits are realised through planning conditions and section 106 agreements
and Community Infrastructure Levy.
Policy 8 – Creating opportunities between low to zero carbon energy supply for London and air
quality impacts:
Applying emissions limits for biomass boilers across London;
Requiring an emissions assessment to be included at the planning application stage.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 33 of 55 March 2016
Low Emission Zone (LEZ)
A1.2 A key measure to improve air quality in Greater London is the Low Emission Zone (LEZ). This
entails charges for vehicles entering Greater London not meeting certain emissions criteria, and
affects older, diesel-engined lorries, buses, coaches, large vans, minibuses and other specialist
vehicles derived from lorries and vans. The LEZ was introduced on 4th February 2008, and was
phased in through to January 2012. From January 2012 a standard of Euro IV was implemented
for lorries and other specialist diesel vehicles over 3.5 tonnes, and buses and coaches over 5
tonnes. Cars and lighter Light Goods Vehicles (LGVs) are excluded. The third phase of the LEZ,
which applies to larger vans, minibuses and other specialist diesel vehicles, was also implemented
in January 2012. As set out in the 2010 MAQS, a NOx emissions standard (Euro IV) is included in
the LEZ for HGVs, buses and coaches, from 2015.
Ultra Low Emission Zone (ULEZ)
A1.3 The Mayor has confirmed the introduction of the Ultra Low Emission Zone (ULEZ) in the Capital on
7 September 2020. The ULEZ will operate 24 hours a day, 7 days a week in the same area as the
current Congestion Charging zone. All cars, motorcycles, vans, minibuses and Heavy Goods
Vehicles will need to meet exhaust emission standards (ULEZ standards) or pay an additional daily
charge to travel within the zone. The ULEZ standards are Euro 3 for motorcycles; Euro 4 for petrol
cars, vans and minibuses; Euro 6 for diesel cars, vans and minibuses; and Euro VI for HGVs,
buses and coaches.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 34 of 55 March 2016
A2 EPUK & IAQM Planning for Air Quality Guidance
A2.1 The guidance issued by EPUK and IAQM6 (EPUK & IAQM, 2015) is comprehensive in its
explanation of the place of air quality in the planning regime. Key sections of the guidance not
already mentioned above are set out below.
Air Quality as a Material Consideration
“Any air quality issue that relates to land use and its development is capable of being a material
planning consideration. The weight, however, given to air quality in making a planning application
decision, in addition to the policies in the local plan, will depend on such factors as:
the severity of the impacts on air quality;
the air quality in the area surrounding the proposed development;
the likely use of the development, i.e. the length of time people are likely to be exposed at that
location; and
the positive benefits provided through other material considerations”.
Impact Descriptors and Assessment of Significance
A2.2 There is no official guidance in the UK in relation to development control on how to describe the
nature of air quality impacts, nor how to assess their significance. The approach developed by
EPUK and IAQM (EPUK & IAQM, 2015) has therefore been used. This approach involves a two
stage process:
a qualitative or quantitative description of the impacts on local air quality arising from the
development; and
a judgement on the overall significance of the effects of any impacts.
Impact Descriptors
A2.3 Impact description involves expressing the magnitude of incremental change as a proportion of a
relevant assessment level and then examining this change in the context of the new total
concentration and its relationship with the assessment criterion. Table A2.1 sets out the method
for determining the impact descriptor for annual mean concentrations at individual receptors,
having been adapted from the table presented in the guidance document. For the assessment
criterion the term Air Quality Assessment Level or AQAL has been adopted, as it covers all
pollutants, i.e. those with and without formal standards. Typically, as is the case for this
6 The IAQM is the professional body for air quality practitioners in the UK.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 35 of 55 March 2016
assessment, the AQAL will be the air quality objective value. Note that impacts may be adverse or
beneficial, depending on whether the change in concentration is positive or negative.
Table A2.1: Air Quality Impact Descriptors for Individual Receptors for All Pollutants a
Long-Term Average Concentration At
Receptor In Assessment Year
b
Change in concentration relative to AQAL c
0% 1% 2-5% 6-10% >10%
75% or less of AQAL Negligible Negligible Negligible Slight Moderate
76-94% of AQAL Negligible Negligible Slight Moderate Moderate
95-102% of AQAL Negligible Slight Moderate Moderate Substantial
103-109% of AQAL Negligible Moderate Moderate Substantial Substantial
110% or more of AQAL Negligible Moderate Substantial Substantial Substantial
a Values are rounded to the nearest whole number.
b This is the ‘without scheme’ concentration where there is a decrease in pollutant concentration and the
‘with scheme’ concentration where there is an increase.
c AQAL = Air Quality Assessment Level, which may be an air quality objective, EU limit or target value, or
an Environment Agency ‘Environmental Assessment Level (EAL)’.
Assessment of Significance
A2.4 The IAQM guidance (EPUK & IAQM, 2015) is that the assessment of significance should be based
on professional judgement, with the overall air quality impact of the scheme described as either
significant or not significant. In drawing this conclusion, the following factors should be taken into
account:
the existing and future air quality in the absence of the development;
the extent of current and future population exposure to the impacts;
the influence and validity of any assumptions adopted when undertaking the prediction of
impacts;
the potential for cumulative impacts and, in such circumstances, several impacts that are
described as ‘slight’ individually could, taken together, be regarded as having a significant
effect for the purposes of air quality management in an area, especially where it is proving
difficult to reduce concentrations of a pollutant. Conversely, a ‘moderate’ or ‘substantial’
impact may not have a significant effect if it is confined to a very small area and where it is
not obviously the cause of harm to human health; and
the judgement on significance relates to the consequences of the impacts; will they have
an effect on human health that could be considered as significant? In the majority of
cases, the impacts from an individual development will be insufficiently large to result in
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 36 of 55 March 2016
measurable changes in health outcomes that could be regarded as significant by health
care professionals.
A2.5 The guidance is clear that other factors may be relevant in individual cases. It also states that the
effect on the residents of any new development where the air quality is such that an air quality
objective is not met will be judged as significant. For people working at new developments in this
situation, the same will not be true as occupational exposure standards are different, although any
assessment may wish to draw attention to the undesirability of the exposure.
A2.6 A judgement of the significance should be made by a competent professional who is suitably
qualified. A summary of the professional experience of the staff contributing to this assessment is
provided in Appendix A3.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 37 of 55 March 2016
A3 Professional Experience
Stephen Moorcroft, BSc (Hons) MSc DIC MIEnvSc MIAQM CEnv
Mr Moorcroft is a Director of Air Quality Consultants, and has worked for the company since 2004.
He has over thirty-five years’ postgraduate experience in environmental sciences. Prior to joining
Air Quality Consultants, he was the Managing Director of Casella Stanger, with responsibility for a
business employing over 100 staff and a turnover of £12 million. He also acted as the Business
Director for Air Quality services, with direct responsibility for a number of major Government
projects. He has considerable project management experience associated with Environmental
Assessments in relation to a variety of development projects, including power stations, incinerators,
road developments and airports, with particular experience related to air quality assessment,
monitoring and analysis. He has contributed to the development of air quality management in the
UK, and has been closely involved with the LAQM process since its inception. He has given expert
evidence to numerous public inquiries, and is frequently invited to present to conferences and
seminars. He is a Member of the Institute of Air Quality Management.
Dr Ben Marner, BSc (Hons) PhD CSci MIEnvSc MIAQM
Dr Marner is a Technical Director with AQC, and has seventeen years’ experience in the field of air
quality. He has been responsible for air quality and greenhouse gas assessments of road
schemes, rail schemes, airports, power stations, waste incinerators, commercial developments and
residential developments in the UK and abroad. He has been an expert witness at several public
inquiries, where he has presented evidence on health-related air quality impacts, the impacts of air
quality on sensitive ecosystems, and greenhouse gas impacts. He has extensive experience of
using detailed dispersion models, as well as contributing to the development of modelling best
practices. Dr Marner has arranged and overseen air quality monitoring surveys, as well as
contributing to Defra guidance on harmonising monitoring methods. He has been responsible for
air quality review and assessments on behalf of numerous local authorities. He has also
developed methods to predict nitrogen deposition fluxes on behalf of the Environment Agency,
provided support and advice to the UK Government’s air quality review and assessment helpdesk,
Transport Scotland, Transport for London, and numerous local authorities. He is a Member of the
Institute of Air Quality Management and a Chartered Scientist.
Full CVs are available at www.aqconsultants.co.uk.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 38 of 55 March 2016
A4 Modelling Methodology
Model Inputs
Traffic Data and Emissions Calculations
A4.1 As explained in Section 4, Norman Rourke Pryme provided detailed information on traffic flows (by
vehicle type) and speeds for each of the key vehicle lanes and turning movements across the
study area. These covered the morning peak, evening peak, and interpeak periods. Norman
Rourke Pryme also provided a set of factors to use to predict off-peak flows and annual average
flows. The latter was used to calculate average weekend flows; such that the average daily flow
across a week equalled the predicted annual average daily flow. Speeds during the off-peak
periods and weekend were assumed to be equal to those predicted for the interpeak.
A4.2 While the traffic data provided included all of the key turning movements in the network, they also
included information on lane changes and other ‘events’ on the network that could not feasibly be
included in the dispersion modelling. It was thus necessary to edit the traffic dataset to ensure a
consistent coverage across the network and to remove instances of double counting. In some
cases, it was also necessary to calculate flows on additional links within junctions.
A4.3 The predicted hourly-mean flows and speeds for each vehicle class were entered into Defra’s
Emissions Factor Toolkit (EFT V6.02) (Defra, 2016) to calculate hourly average vehicle-type-
specific emissions of nitrogen oxides, PM10 and PM2.5. In order to do this, it was necessary to set
the speed for all movements with a predicted hourly average speed less than 5 kph to equal 5 kph.
The EFT was used to generate emissions specific to ‘inner London’.
A4.4 The hourly-average emissions from the EFT were collated as a set of diurnal and weekly
emissions profiles (i.e. with constant emissions during each period and constant emissions over
the weekends). Each link and each turning movement had its own set of emissions profiles.
Sensitivity Test for Nitrogen Oxides and Nitrogen Dioxide
A4.5 As explained in Section 4, AQC has carried out a detailed analysis which showed that, where
previous standards had limited on-road success in reducing nitrogen oxides emissions from diesel
vehicles, the ‘Euro VI’ and ‘Euro 6’ standards are delivering real on-road improvements (AQC,
2016a). Furthermore, these improvements are expected to increase as the Euro 6 standard is fully
implemented. Despite this, the detailed analysis suggested that, in addition to modelling using the
EFT, a sensitivity test using elevated nitrogen oxides emissions from certain diesel should be
carried out (AQC, 2016a). A worst-case sensitivity test has thus been carried out by applying the
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 39 of 55 March 2016
adjustments set out in Table A4.1 to the emission factors used within the EFT7. The justifications
for these adjustments are given in AQC (2016a). Results are thus presented for two scenarios:
first the ‘official prediction’, which uses the EFT with no adjustment, and second the ‘worst-case
sensitivity test’, which applies the adjustments set out in Table A4.1. The results from this
sensitivity test are likely to over-predict emissions from vehicles in the future and thus provide a
reasonable worst-case upper-bound to the assessment.
Table A4.1: Summary of Adjustments Made to Emission Factor Toolkit
Vehicle Type Adjustment Applied to Emission Factors
All Petrol Vehicles No adjustment
Light Duty Diesel Vehicles
Euro 5 and earlier No adjustment
Euro 6 Increased by 60%
Heavy Duty Diesel Vehicles
Euro III and earlier No adjustment
Euro IV and V Set to equal Euro III values
Euro VI Set to equal 20% of Euro III emissions a
a Taking account of the speed-emission curves for different Euro classes as explained in AQC (2016a).
Dispersion Modelling
A4.1 Predictions have been carried out using the ADMS-Roads dispersion model (v3.4). Each of the
roads/movements described above was entered as a separate source, and the diurnal emissions
profiles were entered as ‘.fac’ files. Each road/movement was assigned a width based on the
number of lanes involved. Because the network was modelled as a large number of sources, it
was not practical to use the ADMS canyon module. In practice, since virtually all of the roads in
the study area can be described as street canyons, and because the model has been verified
against measurements made in two of these street canyons, the canyon effect has been implicitly
accounted for through the model verification and adjustment.
A4.2 As an example of how the roads were entered into ADMS, Figure A4.1 shows a small excerpt from
the modelled network. The extent of the full modelled network is shown in full in Figure 1.
A4.3 The model has been run using the full year of meteorological data that corresponds to the most
recent set of nitrogen dioxide monitoring data (2014). The meteorological data has been taken
from the monitoring station located at Heathrow Airport, which is considered suitable for this area.
7 All adjustments were applied to the COPERT functions. Fleet compositions etc. were applied following the same
methodology as used within the EFT.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 40 of 55 March 2016
Figure A4.1: Excerpt from Modelled Road Network (See Figure 1 for full network).
Background Concentrations
Annual Mean Concentrations
A4.4 The background pollutant concentrations across the study area have been defined using the
national pollution maps published by Defra (2016). These cover the whole country on a 1x1 km
grid and are published for each year from 2011 until 2030.
A4.5 The mapped background nitrogen dioxide concentrations for 2014 have been verified against
concurrent measurements made at the urban background automatic monitoring sites at Russell
Square Gardens in Bloomsbury (‘London Bloomsbury’), Horseferry Road in Westminster
(‘Horseferry Road’), and St Charles Square in Kensington and Chelsea (‘North Ken’). These sites
are shown in Figure A4.2. The sites were chosen since they are the closest urban background
automatic monitoring sites to the study area. A further site (Westminster Victoria) was discounted
from this analysis, since it was not considered to ideally represent background concentrations due
to the proximity of emission sources. The verification is shown in Figure A4.3 and Figure A4.4. It
is concluded that Defra’s maps currently under-predict annual mean nitrogen dioxide
concentrations in the area by around 5%, but that they over-predict concentrations of PM10. All
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 41 of 55 March 2016
mapped background nitrogen dioxide and PM10 concentrations have thus been calibrated by
applying factors of 1.0512 and 0.716 respectively.
A4.6 A similar comparison was not possible for PM2.5. The background PM2.5 maps have thus been
calibrated using the factor for PM10 (0.716).
Figure A4.2: Urban Background Monitors used to Calibrate Defra’s Background Maps
Contains Ordnance Survey data © Crown copyright and database right 2016
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 42 of 55 March 2016
Figure A4.3: Comparison of Measured and Estimated Background- Annual Mean Nitrogen Dioxide Concentrations at all Three Urban Background Automatic Monitoring Sites in 2014 (µg/m
3)
Figure A4.4: Comparison of Measured and Estimated Background Annual Mean PM10 Concentrations at all Three Urban Background Automatic Monitoring Sites in 2014 (µg/m
3)
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 43 of 55 March 2016
Background Annual Mean NO2 Concentrations for Sensitivity Test
A4.7 The road-traffic components of nitrogen dioxide in the background maps have been uplifted in
order to derive future year background nitrogen dioxide concentrations for use in the sensitivity
test. Details of the approach are provided in the report prepared by AQC (2016b).
Hour-by-hour NO2 Concentrations
A4.8 In order to calculate the 99.79th percentiles of 1-hour mean nitrogen dioxide concentrations, hour-
by-hour background nitrogen oxides concentrations are required. These were taken from the 2014
dataset from the London Bloomsbury site.
Model Verification
A4.9 In order to ensure that ADMS-Roads accurately predicts local concentrations, it is necessary to
verify the model against local measurements.
Nitrogen Dioxide
A4.10 Most nitrogen dioxide (NO2) is produced in the atmosphere by reaction of nitric oxide (NO) with
ozone. It is therefore most appropriate to verify the model in terms of primary pollutant emissions
of nitrogen oxides (NOx = NO + NO2). The model has been run to predict the annual mean NOx
concentrations during 2014 at the Marylebone Road and Oxford Street monitors.
A4.11 The model output of road-NOx (i.e. the component of total NOx coming from road traffic) has been
compared with the ‘measured’ road-NOx. Measured road-NOx has been calculated from the
measured NO2 concentrations and the predicted background NO2 concentration using the NOx
from NO2 calculator (Version 4.1) available on the Defra LAQM Support website (Defra, 2016).
A4.12 An adjustment factor has been determined as the slope of the best-fit line between the ‘measured’
road contribution and the model derived road contribution, forced through zero (Figure A4.5). The
calculated adjustment factor of 3.334 has been applied to the modelled road-NOx concentration for
each receptor to provide adjusted modelled road-NOx concentrations.
A4.13 The total nitrogen dioxide concentrations have then been determined by combining the adjusted
modelled road-NOx concentrations with the predicted background NO2 concentration within the
NOx to NO2 calculator. Figure A4.6 compares final adjusted modelled total NO2 at each of the
monitoring sites to measured total NO2, and shows a close agreement.
A4.14 The model has over-predicted concentrations at Marylebone Road and under-predicted
concentrations at Oxford Street. The most likely explanations for this are:
Oxford Street is likely to experience a greater street canyon effect than Marylebone Road, and
it was not possible to account for this in the model; and
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 44 of 55 March 2016
having to round very slow (<5 kph) hourly speeds up to 5 kph may have resulted in emissions
along this section of Oxford Street being slightly under-predicted.
A4.15 The results imply that the model has under predicted the road-NOx contribution. This is a common
experience with this and most other models. The adjustment factor is slightly higher than might
usually be expected because it is being used to account for the effects of street canyons. These
model adjustment factors have been applied to both annual mean and 1-hour mean model outputs.
Figure A4.5: Comparison of Measured Road NOx to Unadjusted Modelled Road NOx Concentrations. The dashed lines show ± 25%.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 45 of 55 March 2016
Figure A4.6: Comparison of Measured Total NO2 to Final Adjusted Modelled Total NO2 Concentrations. The dashed lines show ± 25%.
PM10 and PM2.5
A4.16 The model has been run to predict annual mean road-PM concentrations during 2014 at the
Marylebone Road monitor. A similar process to calculate the road-NOx adjustment factor has
been followed.
A4.17 The measured road-PM10 and modelled road-PM10 concentrations are compared to provide the
factor for PM10. The data used to calculate the adjustment factor are provided below:
Measured PM10: 26.3 μg/m3
‘Measured’ road-PM10 (measured – background at monitor): 26.3 –17.4 = 8.8 μg/m3
Modelled road-PM10 = 4.6 μg/m3
Road-PM10 adjustment factor: 8.8 / 4.6 = 1.908 (calculated from unrounded numbers)
A4.18 The measured road-PM2.5 and modelled road-PM2.5 concentrations have also been compared to
provide a factor for PM2.5. The data used to calculate the adjustment factor are provided below:
Measured PM2.5: 18.3 μg/m3
‘Measured’ road-PM2.5 (measured – background at monitor): 18.3 – 11.9 = 6.4 μg/m3
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 46 of 55 March 2016
Modelled road-PM2.5 = 3.5 μg/m3
Road-PM2.5 adjustment factor: 6.4 / 3.5 = 1.817 (calculated from unrounded numbers).
Model Verification for NOx and NO2 Sensitivity Test
A4.19 The approach set out above has been repeated using the predicted road-NOx specific to the
sensitivity test. This has resulted in an adjustment factor of 2.783, which has been applied to all
modelled road-NOx concentrations within the sensitivity test.
Model Post-processing
The model predicts road-NOx concentrations at each receptor location. These concentrations
have then been adjusted using the adjustment factor, which, along with the background NO2, has
been processed through the NOx to NO2 calculator available on the Defra LAQM Support website
(Defra, 2016). The traffic mix within the calculator has been set to “All London traffic”, which is
considered suitable for the study area. The calculator predicts the component of NO2 based on the
adjusted road-NOx and the background NO2.
1-hour Mean Nitrogen Oxides and Nitrogen Dioxide
A4.20 In order to predict 1-hour mean nitrogen dioxide concentrations, the model was run to predict hour-
by-hour concentrations for every hour of the year (i.e. 8760 values per receptor). These hourly-
mean nitrogen oxides results were multiplied by the primary adjustment factors given in
Paragraphs A4.12 and A4.19 and then added to the concurrent hourly nitrogen oxides
measurement from the Russell Square Gardens (Bloomsbury) background monitor.
A4.21 In order to derive a nitrogen oxides to nitrogen dioxide relationship for the study area, the
measurements from the Marylebone Road and Oxford Street monitors were plotted (Figure A4.7).
The relationship between hourly nitrogen oxides and nitrogen dioxide concentrations was
determined to be as shown by the line and equation in Figure A4.7.
A4.22 The 99.79th percentiles of predicted hourly-mean nitrogen oxides concentrations were multiplied by
the relationship shown in Figure A4.7 to give the equivalent predicted nitrogen dioxide
concentration.
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 47 of 55 March 2016
Figure A4.7: Hourly Mean Nitrogen Oxides vs Nitrogen Dioxide at Marylebone Road and Oxford Street in 2014 (µg/m
3) (also showing best-fit relationship)
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 48 of 55 March 2016
A5 Adjustment of Short-Term Data to Annual Mean
A5.1 Data capture for nitrogen dioxide at the Oxford Street monitor during 2014 was only 74%. The
data have been adjusted to an annual mean, based on the ratio of concentrations during the
available monitoring period to those over the calendar year at the Marylebone Road site. This is
considered to be more appropriate than focusing on trends at background sites, which will be quite
different from those at roadside sites.
A5.2 The annual mean nitrogen dioxide concentrations and the period mean for at the Marylebone Road
monitor from which adjustment factor has been calculated are presented in Table A5.1.
Table A5.1: Data used to Adjust Monitoring Data at the Oxford Street Monitor
Period Marylebone Road
Periods when Oxford Street produced valid data 94.6 µg/m3
Full calendar year 93.6 µg/m3
Adjustment Factor 0.99
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 49 of 55 March 2016
A6 Predicted Concentrations
A6.1 Predicted concentrations at all of the receptors are set out in Table A6.1, which uses the following nomenclature:
DM = without Scheme
DS = with Scheme
Ch1 = absolute change
Ch2 = percentage change
Ch3 = change as percentage of the objective rounded to the nearest whole number. For PM10, while the annual mean objective is 40 µg/m3, 32 µg/m
3 is the annual mean concentration above which an exceedence of the 24-hour
mean PM10 concentration is possible, as outlined in LAQM.TG(09) (Defra, 2009). A value of 32 µg/m3 is thus used as a proxy to determine the likelihood of exceedence of the 24-hour mean PM10 objective, as recommended
in EPUK & IAQM guidance (EPUK & IAQM, 2015).
D = IAQM Impact Descriptor (see Appendix A2)
SA = Substantial Adverse (see Appendix A2)
MA = Moderate Adverse (see Appendix A2)
SlA = Slight Adverse (see Appendix A2)
N = Negligible (see Appendix A2)
MB = Moderate Beneficial (see Appendix A2)
SB = Substantial Beneficial (see Appendix A2)
Table A6.1: Dispersion Model Results a
‘Official’ Annual Mean NO2 Official 99.8th
%iles of 1h NO2 Sensitivity Test Annual Mean NO2 Sensitivity 99.8h %iles 1h NO2 Annual Mean PM10 Annual Mean PM2.5
R DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 D
1 46.0 43.9 -2.0 -4.4 -5 SB 103 99 -4 -4 -2 48.3 46.1 -2.2 -4.6 -6 SB 106 102 -4 -4 -2 17.2 17.1 -0.1 -0.7 0 N 11.5 11.4 -0.1 -0.6 0 N
2 46.0 43.8 -2.2 -4.9 -6 SB 104 100 -4 -4 -2 48.3 45.9 -2.5 -5.1 -6 SB 108 102 -6 -6 -3 17.2 17.1 -0.1 -0.8 0 N 11.5 11.4 -0.1 -0.7 0 N
3 46.6 44.4 -2.1 -4.6 -5 SB 106 101 -4 -4 -2 48.9 46.6 -2.3 -4.7 -6 SB 109 105 -4 -4 -2 17.2 17.1 -0.1 -0.8 0 N 11.5 11.4 -0.1 -0.6 0 N
4 46.6 44.7 -1.9 -4.1 -5 SB 105 101 -4 -4 -2 49.0 46.9 -2.1 -4.2 -5 SB 109 105 -4 -3 -2 17.3 17.1 -0.1 -0.7 0 N 11.5 11.4 -0.1 -0.6 0 N
5 55.7 55.8 0.1 0.2 0 N 142 147 5 4 3 58.4 58.7 0.2 0.4 1 MA 150 153 3 2 2 18.0 18.0 0.0 -0.2 0 N 12.0 11.9 0.0 -0.1 0 N
6 56.7 56.2 -0.5 -0.9 -1 MB 148 147 -1 0 0 59.5 59.0 -0.4 -0.7 -1 MB 154 154 0 0 0 18.1 18.0 -0.1 -0.6 0 N 12.0 12.0 -0.1 -0.4 0 N
7 58.2 58.5 0.2 0.4 1 MA 120 121 1 1 1 61.1 61.4 0.3 0.6 1 MA 124 125 1 0 0 18.3 18.3 0.0 0.0 0 N 12.1 12.1 0.0 0.1 0 N
8 58.8 58.4 -0.4 -0.7 -1 MB 122 122 -1 -1 0 61.6 61.3 -0.4 -0.6 -1 MB 126 127 1 1 0 18.3 18.3 -0.1 -0.5 0 N 12.1 12.1 0.0 -0.3 0 N
9 55.0 53.5 -1.5 -2.8 -4 SB 125 122 -3 -2 -1 58.5 57.3 -1.2 -2.0 -3 SB 132 132 0 0 0 17.8 17.6 -0.2 -1.0 -1 N 11.8 11.7 -0.1 -0.8 0 N
10 52.8 51.9 -0.8 -1.6 -2 SB 117 116 -1 -1 -1 55.8 55.3 -0.5 -0.9 -1 MB 123 123 0 0 0 17.7 17.6 -0.1 -0.6 0 N 11.8 11.7 -0.1 -0.5 0 N
11 55.7 54.5 -1.2 -2.2 -3 SB 127 128 1 1 0 59.2 58.5 -0.7 -1.3 -2 SB 135 137 2 1 1 17.9 17.7 -0.2 -0.9 -1 N 11.9 11.8 -0.1 -0.9 0 N
12 63.0 61.1 -2.0 -3.1 -5 SB 142 129 -14 -10 -7 66.9 65.0 -2.0 -3.0 -5 SB 150 135 -15 -10 -8 18.5 18.4 -0.1 -0.3 0 N 12.2 12.2 0.0 0.0 0 N
13 63.1 57.1 -6.1 -9.6 -15 SB 178 148 -30 -17 -15 67.5 60.7 -6.8 -10.1 -17 SB 194 158 -36 -18 -18 18.4 18.0 -0.3 -1.8 -1 N 12.2 12.0 -0.2 -1.5 -1 N
14 63.8 61.7 -2.1 -3.2 -5 SB 138 129 -9 -7 -5 68.1 66.5 -1.6 -2.4 -4 SB 146 136 -10 -7 -5 18.4 18.3 -0.1 -0.6 0 N 12.2 12.2 0.0 0.0 0 N
15 54.2 51.5 -2.8 -5.1 -7 SB 130 121 -9 -7 -4 57.4 54.6 -2.8 -4.9 -7 SB 138 128 -9 -7 -5 17.7 17.6 -0.2 -0.8 0 N 11.8 11.7 -0.1 -0.5 0 N
16 60.3 57.5 -2.8 -4.6 -7 SB 153 145 -8 -5 -4 63.9 61.2 -2.7 -4.2 -7 SB 162 153 -8 -5 -4 18.3 18.1 -0.2 -0.8 0 N 12.1 12.0 0.0 -0.4 0 N
17 62.8 60.5 -2.3 -3.6 -6 SB 135 129 -6 -5 -3 66.8 64.1 -2.7 -4.1 -7 SB 144 135 -9 -6 -4 18.4 18.3 -0.1 -0.4 0 N 12.1 12.1 0.0 -0.1 0 N
18 56.2 52.9 -3.3 -5.8 -8 SB 141 130 -11 -8 -6 59.4 55.8 -3.6 -6.1 -9 SB 149 135 -14 -9 -7 17.9 17.7 -0.2 -1.1 -1 N 11.9 11.8 -0.1 -0.8 0 N
19 62.4 58.7 -3.7 -5.9 -9 SB 140 129 -11 -8 -6 66.6 63.2 -3.4 -5.1 -9 SB 150 139 -10 -7 -5 18.3 18.0 -0.3 -1.7 -1 N 12.2 12.0 -0.2 -1.4 -1 N
20 65.3 64.1 -1.1 -1.7 -3 SB 139 139 0 0 0 70.3 70.2 -0.1 -0.1 0 N 149 155 6 4 3 18.6 18.2 -0.4 -2.1 -1 N 12.4 12.1 -0.2 -2.0 -1 N
21 66.4 61.4 -5.0 -7.5 -12 SB 139 128 -11 -8 -5 71.4 66.6 -4.8 -6.7 -12 SB 150 140 -10 -7 -5 18.6 18.1 -0.5 -2.7 -2 N 12.3 12.1 -0.3 -2.4 -1 N
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 50 of 55 March 2016
‘Official’ Annual Mean NO2 Official 99.8th
%iles of 1h NO2 Sensitivity Test Annual Mean NO2 Sensitivity 99.8h %iles 1h NO2 Annual Mean PM10 Annual Mean PM2.5
R DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 D
22 64.6 59.0 -5.6 -8.7 -14 SB 161 138 -23 -14 -11 68.9 63.7 -5.2 -7.5 -13 SB 171 150 -21 -12 -11 18.6 17.9 -0.7 -3.6 -2 N 12.3 11.9 -0.4 -3.3 -2 N
23 63.8 60.4 -3.4 -5.3 -8 SB 134 128 -6 -4 -3 68.6 64.9 -3.8 -5.5 -9 SB 143 135 -9 -6 -4 18.4 18.1 -0.3 -1.5 -1 N 12.2 12.0 -0.2 -1.4 -1 N
24 70.5 62.2 -8.3 -11.8 -21 SB 183 156 -27 -15 -13 75.3 67.0 -8.3 -11.0 -21 SB 197 170 -28 -14 -14 19.4 18.2 -1.2 -6.4 -4 N 13.0 12.1 -0.9 -6.9 -4 N
25 72.8 64.5 -8.3 -11.5 -21 SB 189 164 -25 -13 -13 77.5 69.5 -8.0 -10.3 -20 SB 204 178 -26 -13 -13 20.0 18.4 -1.6 -7.8 -5 N 13.4 12.2 -1.2 -9.1 -5 N
26 55.7 52.8 -2.9 -5.1 -7 SB 121 115 -7 -6 -3 58.6 55.7 -2.9 -4.9 -7 SB 128 120 -8 -6 -4 18.0 17.7 -0.3 -1.6 -1 N 12.0 11.8 -0.2 -1.5 -1 N
27 55.5 52.5 -3.0 -5.3 -7 SB 119 114 -5 -4 -2 58.3 55.3 -3.0 -5.1 -7 SB 126 119 -7 -6 -4 18.0 17.7 -0.3 -1.6 -1 N 12.0 11.8 -0.2 -1.4 -1 N
28 47.3 45.4 -1.9 -4.1 -5 SB 109 104 -5 -4 -2 49.8 47.8 -2.1 -4.1 -5 SB 115 107 -8 -7 -4 17.3 17.2 -0.1 -0.7 0 N 11.5 11.5 -0.1 -0.6 0 N
29 57.8 55.0 -2.8 -4.8 -7 SB 125 118 -7 -6 -4 60.8 58.1 -2.7 -4.5 -7 SB 134 125 -9 -7 -4 18.2 17.9 -0.3 -1.6 -1 N 12.1 11.9 -0.2 -1.5 -1 N
30 48.5 46.4 -2.1 -4.3 -5 SB 114 106 -8 -7 -4 51.1 48.9 -2.2 -4.3 -6 SB 118 110 -8 -7 -4 17.4 17.2 -0.1 -0.7 0 N 11.6 11.5 -0.1 -0.6 0 N
31 57.6 54.7 -2.9 -5.1 -7 SB 126 119 -7 -6 -4 60.5 57.6 -2.9 -4.9 -7 SB 133 126 -7 -5 -3 18.2 17.9 -0.3 -1.6 -1 N 12.1 11.9 -0.2 -1.5 -1 N
32 55.0 51.2 -3.8 -6.9 -9 SB 115 106 -9 -8 -5 58.0 53.9 -4.1 -7.0 -10 SB 123 111 -12 -10 -6 17.9 17.6 -0.3 -1.6 -1 N 11.9 11.7 -0.2 -1.5 -1 N
33 70.5 62.2 -8.3 -11.8 -21 SB 153 128 -24 -16 -12 74.1 65.4 -8.8 -11.8 -22 SB 162 133 -29 -18 -14 19.3 18.6 -0.7 -3.7 -2 N 12.8 12.4 -0.4 -3.5 -2 N
34 45.0 44.1 -0.9 -2.0 -2 SB 102 100 -2 -2 -1 47.1 46.2 -0.9 -2.0 -2 SB 104 102 -1 -1 -1 17.2 17.1 -0.1 -0.3 0 N 11.4 11.4 0.0 -0.3 0 N
35 70.0 63.7 -6.3 -9.0 -16 SB 148 127 -21 -14 -10 73.8 67.1 -6.6 -9.0 -17 SB 154 135 -19 -12 -9 19.2 18.7 -0.5 -2.7 -2 N 12.8 12.4 -0.3 -2.5 -1 N
36 45.7 44.8 -0.9 -1.9 -2 SB 103 101 -2 -2 -1 47.8 46.9 -0.9 -1.9 -2 SB 106 104 -2 -2 -1 17.2 17.1 -0.1 -0.3 0 N 11.5 11.4 0.0 -0.3 0 N
37 49.7 48.2 -1.5 -3.0 -4 SB 105 101 -3 -3 -2 52.3 50.9 -1.4 -2.7 -4 SB 109 106 -3 -3 -2 17.5 17.4 -0.1 -0.8 0 N 11.7 11.6 -0.1 -0.7 0 N
38 58.9 58.2 -0.6 -1.1 -2 SB 109 106 -4 -3 -2 61.5 60.7 -0.8 -1.3 -2 SB 113 109 -4 -3 -2 19.0 19.0 0.0 -0.2 0 N 12.6 12.6 0.0 -0.2 0 N
39 50.7 48.9 -1.9 -3.7 -5 SB 109 102 -7 -7 -4 53.4 51.6 -1.8 -3.4 -5 SB 113 107 -6 -5 -3 17.6 17.4 -0.2 -1.0 -1 N 11.7 11.6 -0.1 -0.9 0 N
40 56.8 55.9 -1.0 -1.7 -2 SB 112 111 -1 -1 -1 59.3 58.2 -1.1 -1.8 -3 SB 116 115 -1 -1 0 18.8 18.8 -0.1 -0.4 0 N 12.5 12.5 0.0 -0.4 0 N
41 59.6 56.3 -3.2 -5.4 -8 SB 122 116 -6 -5 -3 62.4 59.0 -3.3 -5.3 -8 SB 127 118 -9 -7 -5 18.4 18.1 -0.3 -1.6 -1 N 12.2 12.0 -0.2 -1.4 -1 N
42 55.4 54.3 -1.1 -2.1 -3 SB 141 135 -6 -4 -3 58.0 56.8 -1.2 -2.1 -3 SB 145 140 -5 -3 -3 18.0 17.9 -0.1 -0.5 0 N 12.0 11.9 -0.1 -0.4 0 N
43 58.0 57.9 -0.1 -0.1 0 N 123 123 -1 -1 0 61.0 61.0 0.0 0.0 0 N 128 126 -2 -1 -1 18.2 18.2 0.0 0.0 0 N 12.0 12.1 0.0 0.2 0 N
44 55.6 54.9 -0.7 -1.3 -2 SB 141 141 0 0 0 58.5 57.8 -0.6 -1.1 -2 SB 147 148 1 1 1 18.0 17.9 -0.1 -0.4 0 N 11.9 11.9 0.0 -0.2 0 N
45 75.1 71.7 -3.4 -4.6 -9 SB 163 154 -9 -6 -4 80.9 77.4 -3.5 -4.3 -9 SB 176 166 -10 -6 -5 19.6 19.1 -0.5 -2.4 -1 N 13.0 12.7 -0.3 -2.6 -1 N
46 77.6 72.2 -5.4 -7.0 -14 SB 200 187 -12 -6 -6 83.4 77.6 -5.8 -7.0 -15 SB 217 200 -17 -8 -8 19.8 19.2 -0.6 -3.2 -2 N 13.2 12.7 -0.4 -3.2 -2 N
47 100.7 94.5 -6.2 -6.1 -15 SB 244 229 -15 -6 -8 107.9 100.9 -7.0 -6.5 -18 SB 258 239 -20 -8 -10 23.0 22.3 -0.7 -3.2 -2 N 15.1 14.6 -0.5 -3.2 -2 N
48 97.4 92.9 -4.5 -4.7 -11 SB 207 195 -12 -6 -6 105.0 99.7 -5.2 -5.0 -13 SB 224 206 -17 -8 -9 22.4 21.9 -0.5 -2.1 -1 N 14.7 14.4 -0.3 -2.0 -1 N
49 66.5 64.0 -2.5 -3.7 -6 SB 142 130 -12 -8 -6 69.5 67.1 -2.4 -3.5 -6 SB 149 135 -14 -9 -7 19.7 19.4 -0.3 -1.3 -1 N 13.0 12.9 -0.2 -1.2 -1 N
50 56.7 52.9 -3.8 -6.6 -9 SB 138 123 -14 -10 -7 59.4 55.2 -4.2 -7.0 -10 SB 145 130 -15 -10 -7 18.1 17.9 -0.3 -1.4 -1 N 12.1 11.9 -0.2 -1.3 -1 N
51 101.9 90.9 -11.0 -10.8 -28 SB 231 212 -19 -8 -9 108.7 96.4 -12.2 -11.3 -31 SB 244 224 -21 -8 -10 23.3 22.1 -1.2 -5.0 -4 N 15.2 14.5 -0.7 -4.8 -3 N
52 75.0 64.1 -10.9 -14.5 -27 SB 207 170 -37 -18 -18 79.2 67.4 -11.8 -14.9 -29 SB 220 180 -41 -18 -20 19.7 18.8 -0.9 -4.6 -3 N 13.0 12.5 -0.6 -4.4 -2 N
53 98.7 90.6 -8.1 -8.2 -20 SB 239 214 -25 -10 -12 104.8 95.9 -8.9 -8.5 -22 SB 250 225 -25 -10 -12 23.0 22.2 -0.8 -3.6 -3 N 15.1 14.6 -0.5 -3.5 -2 N
54 90.3 87.5 -2.7 -3.0 -7 SB 216 210 -6 -3 -3 94.1 91.7 -2.3 -2.5 -6 SB 224 217 -7 -3 -4 22.4 22.3 -0.1 -0.3 0 N 14.7 14.8 0.1 0.5 0 N
55 85.8 85.4 -0.4 -0.5 -1 MB 195 195 -1 0 0 89.3 88.7 -0.5 -0.6 -1 MB 199 200 1 1 1 21.9 22.0 0.1 0.3 0 N 14.5 14.5 0.1 0.5 0 N
56 81.1 79.3 -1.9 -2.3 -5 SB 191 182 -9 -4 -4 84.5 82.8 -1.7 -2.0 -4 SB 198 192 -7 -3 -3 21.3 21.3 0.0 -0.2 0 N 14.0 14.1 0.0 0.3 0 N
57 102.9 94.6 -8.3 -8.1 -21 SB 258 235 -22 -9 -11 107.8 99.9 -7.9 -7.3 -20 SB 271 246 -24 -9 -12 23.8 22.7 -1.1 -4.4 -3 N 15.6 14.9 -0.7 -4.7 -3 N
58 85.7 83.8 -1.9 -2.2 -5 SB 201 197 -5 -2 -2 89.0 87.0 -2.0 -2.2 -5 SB 204 200 -4 -2 -2 21.9 21.7 -0.2 -0.9 -1 N 14.5 14.4 -0.1 -0.8 0 N
59 98.2 94.0 -4.2 -4.3 -11 SB 222 214 -8 -4 -4 103.4 99.3 -4.1 -4.0 -10 SB 234 224 -10 -4 -5 23.1 22.7 -0.4 -1.6 -1 N 15.2 14.9 -0.2 -1.6 -1 N
60 94.4 88.1 -6.3 -6.7 -16 SB 231 208 -23 -10 -11 99.0 92.5 -6.5 -6.6 -16 SB 242 217 -24 -10 -12 23.0 22.3 -0.7 -3.1 -2 N 15.2 14.7 -0.4 -2.9 -2 N
61 81.6 73.4 -8.2 -10.1 -21 SB 201 170 -31 -15 -15 86.5 77.4 -9.1 -10.5 -23 SB 212 178 -34 -16 -17 20.7 19.8 -0.9 -4.5 -3 N 13.7 13.1 -0.6 -4.3 -2 N
62 93.6 88.1 -5.4 -5.8 -14 SB 240 220 -19 -8 -10 98.0 92.4 -5.5 -5.7 -14 SB 246 232 -14 -6 -7 22.9 22.3 -0.6 -2.5 -2 N 15.1 14.8 -0.3 -2.3 -1 N
63 89.9 82.7 -7.2 -8.0 -18 SB 212 200 -12 -5 -6 94.9 86.9 -7.9 -8.3 -20 SB 223 209 -14 -6 -7 21.9 20.9 -1.0 -4.6 -3 N 14.5 13.8 -0.7 -4.9 -3 N
64 77.3 76.2 -1.2 -1.5 -3 SB 181 179 -2 -1 -1 81.0 79.7 -1.3 -1.6 -3 SB 188 188 0 0 0 20.5 20.3 -0.1 -0.7 0 N 13.6 13.5 -0.1 -0.8 0 N
65 89.1 88.1 -1.0 -1.1 -2 SB 228 223 -5 -2 -2 92.0 91.1 -1.0 -1.1 -2 SB 229 223 -5 -2 -3 22.6 22.5 -0.1 -0.5 0 N 15.0 14.9 -0.1 -0.4 0 N
66 91.0 89.5 -1.6 -1.7 -4 SB 224 221 -3 -1 -2 94.2 92.5 -1.6 -1.7 -4 SB 229 221 -8 -3 -4 22.8 22.6 -0.2 -0.8 -1 N 15.1 15.0 -0.1 -0.7 0 N
67 98.7 93.8 -5.0 -5.0 -12 SB 270 243 -26 -10 -13 105.7 99.7 -6.0 -5.7 -15 SB 287 257 -30 -11 -15 22.7 22.3 -0.4 -1.9 -1 N 14.9 14.7 -0.2 -1.6 -1 N
68 101.2 97.2 -4.0 -3.9 -10 SB 245 232 -12 -5 -6 108.9 103.7 -5.1 -4.7 -13 SB 259 242 -17 -7 -8 22.8 22.6 -0.2 -0.8 -1 N 14.9 14.9 0.0 -0.1 0 N
69 101.5 94.6 -6.9 -6.8 -17 SB 245 224 -21 -9 -10 107.7 99.7 -8.1 -7.5 -20 SB 249 229 -20 -8 -10 23.4 23.0 -0.4 -1.5 -1 N 15.5 15.3 -0.2 -1.5 -1 N
70 88.0 87.3 -0.7 -0.8 -2 SB 222 219 -3 -1 -1 91.3 90.5 -0.8 -0.9 -2 SB 224 224 0 0 0 22.3 22.4 0.1 0.3 0 N 14.7 14.8 0.1 0.6 0 N
71 98.4 90.7 -7.7 -7.8 -19 SB 269 248 -21 -8 -10 103.8 95.3 -8.5 -8.2 -21 SB 281 259 -22 -8 -11 23.1 22.5 -0.6 -2.8 -2 N 15.3 14.9 -0.4 -2.8 -2 N
72 87.6 86.8 -0.7 -0.8 -2 SB 217 215 -2 -1 -1 90.9 90.0 -0.9 -1.0 -2 SB 219 220 1 0 0 22.2 22.3 0.1 0.4 0 N 14.7 14.8 0.1 0.9 1 N
73 87.2 86.3 -0.9 -1.1 -2 SB 219 215 -4 -2 -2 90.7 89.8 -0.9 -1.0 -2 SB 225 222 -4 -2 -2 22.2 22.2 0.0 0.1 0 N 14.6 14.7 0.1 0.5 0 N
74 85.2 80.2 -5.0 -5.9 -13 SB 203 186 -17 -8 -9 89.3 83.9 -5.4 -6.0 -13 SB 209 191 -18 -9 -9 21.7 21.0 -0.8 -3.5 -2 N 14.5 13.9 -0.6 -3.8 -2 N
75 86.2 85.1 -1.2 -1.3 -3 SB 214 208 -6 -3 -3 89.7 88.6 -1.1 -1.2 -3 SB 220 213 -7 -3 -4 22.0 22.0 0.0 -0.1 0 N 14.5 14.5 0.0 0.3 0 N
76 87.0 83.0 -4.0 -4.6 -10 SB 223 207 -16 -7 -8 90.7 86.4 -4.3 -4.7 -11 SB 229 213 -16 -7 -8 22.2 21.9 -0.3 -1.3 -1 N 14.5 14.4 -0.1 -0.9 -1 N
77 88.3 83.6 -4.7 -5.3 -12 SB 228 210 -18 -8 -9 92.1 87.1 -5.0 -5.4 -12 SB 235 217 -18 -8 -9 22.3 22.0 -0.4 -1.6 -1 N 14.6 14.4 -0.2 -1.4 -1 N
78 93.1 87.0 -6.1 -6.5 -15 SB 254 228 -25 -10 -13 97.0 90.4 -6.6 -6.8 -16 SB 262 234 -28 -11 -14 23.0 22.4 -0.6 -2.6 -2 N 15.1 14.7 -0.4 -2.7 -2 N
79 96.4 87.1 -9.3 -9.7 -23 SB 245 218 -27 -11 -14 100.4 90.4 -10.0 -10.0 -25 SB 253 223 -30 -12 -15 23.4 22.3 -1.1 -4.8 -3 N 15.4 14.7 -0.8 -4.9 -3 N
80 90.6 83.8 -6.8 -7.5 -17 SB 220 201 -19 -9 -10 94.3 88.0 -6.3 -6.7 -16 SB 226 207 -19 -8 -9 22.1 21.3 -0.8 -3.5 -2 N 14.7 14.2 -0.5 -3.5 -2 N
81 100.6 94.6 -6.0 -5.9 -15 SB 257 229 -28 -11 -14 105.0 99.7 -5.3 -5.0 -13 SB 262 238 -24 -9 -12 23.4 23.0 -0.4 -1.8 -1 N 15.5 15.2 -0.3 -1.7 -1 N
82 87.0 83.1 -3.8 -4.4 -10 SB 226 214 -12 -5 -6 91.0 87.0 -4.0 -4.4 -10 SB 231 220 -11 -5 -6 22.0 21.1 -0.9 -4.0 -3 N 14.7 14.0 -0.7 -4.7 -3 N
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 51 of 55 March 2016
‘Official’ Annual Mean NO2 Official 99.8th
%iles of 1h NO2 Sensitivity Test Annual Mean NO2 Sensitivity 99.8h %iles 1h NO2 Annual Mean PM10 Annual Mean PM2.5
R DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 D
83 77.6 74.2 -3.4 -4.4 -8 SB 196 186 -10 -5 -5 81.1 77.7 -3.4 -4.2 -9 SB 200 190 -10 -5 -5 20.8 20.1 -0.7 -3.6 -2 N 14.0 13.4 -0.6 -4.3 -2 N
84 86.5 82.8 -3.7 -4.2 -9 SB 225 216 -9 -4 -4 90.6 86.5 -4.1 -4.5 -10 SB 231 221 -11 -5 -5 21.8 21.1 -0.7 -3.2 -2 N 14.5 14.0 -0.5 -3.7 -2 N
85 85.5 81.6 -3.9 -4.5 -10 SB 222 211 -11 -5 -5 89.5 85.2 -4.3 -4.8 -11 SB 229 216 -12 -5 -6 21.7 20.9 -0.7 -3.5 -2 N 14.5 13.9 -0.6 -4.1 -2 N
86 84.4 82.6 -1.8 -2.1 -4 SB 220 214 -6 -3 -3 88.3 86.4 -1.9 -2.2 -5 SB 225 219 -6 -3 -3 21.3 21.0 -0.3 -1.4 -1 N 14.2 13.9 -0.2 -1.7 -1 N
87 69.5 66.0 -3.4 -5.0 -9 SB 147 135 -12 -8 -6 72.7 69.2 -3.5 -4.8 -9 SB 153 140 -13 -8 -6 19.7 19.3 -0.3 -1.7 -1 N 13.1 12.9 -0.2 -1.6 -1 N
88 67.5 63.5 -4.0 -6.0 -10 SB 142 132 -10 -7 -5 70.5 66.5 -4.0 -5.7 -10 SB 146 135 -11 -8 -6 19.5 19.1 -0.4 -2.1 -1 N 13.0 12.7 -0.3 -2.0 -1 N
89 68.0 63.3 -4.7 -6.9 -12 SB 140 130 -11 -8 -5 70.9 66.3 -4.6 -6.5 -12 SB 145 135 -10 -7 -5 19.6 19.1 -0.5 -2.6 -2 N 13.0 12.7 -0.3 -2.4 -1 N
90 68.9 62.9 -5.9 -8.6 -15 SB 125 115 -10 -8 -5 71.4 65.3 -6.2 -8.6 -15 SB 128 119 -9 -7 -4 19.8 19.2 -0.5 -2.6 -2 N 13.2 12.9 -0.3 -2.5 -1 N
91 68.0 61.5 -6.5 -9.6 -16 SB 125 113 -11 -9 -6 70.5 63.7 -6.8 -9.6 -17 SB 128 117 -11 -9 -6 19.7 19.1 -0.6 -3.0 -2 N 13.1 12.8 -0.4 -3.0 -2 N
92 63.3 59.3 -4.0 -6.4 -10 SB 124 114 -10 -8 -5 66.0 62.1 -3.9 -5.9 -10 SB 128 119 -9 -7 -4 19.1 18.7 -0.4 -2.1 -1 N 12.8 12.5 -0.3 -2.0 -1 N
93 63.5 58.5 -5.0 -7.9 -13 SB 126 113 -14 -11 -7 66.0 61.2 -4.8 -7.3 -12 SB 130 116 -14 -10 -7 19.2 18.7 -0.5 -2.7 -2 N 12.8 12.5 -0.3 -2.5 -1 N
94 60.4 57.4 -3.0 -5.0 -8 SB 117 106 -11 -9 -5 62.7 59.4 -3.2 -5.2 -8 SB 119 110 -8 -7 -4 18.9 18.6 -0.3 -1.4 -1 N 12.6 12.4 -0.2 -1.4 -1 N
95 60.4 58.0 -2.4 -4.0 -6 SB 116 107 -9 -8 -4 62.7 60.1 -2.6 -4.2 -7 SB 117 113 -4 -3 -2 18.9 18.7 -0.2 -1.0 -1 N 12.6 12.5 -0.1 -1.1 -1 N
96 59.3 58.5 -0.8 -1.4 -2 SB 116 117 1 1 1 61.9 60.5 -1.4 -2.2 -3 SB 119 120 1 1 0 18.7 18.7 0.0 0.0 0 N 12.5 12.5 0.0 -0.2 0 N
97 59.3 57.7 -1.7 -2.8 -4 SB 118 116 -2 -2 -1 61.7 59.5 -2.1 -3.4 -5 SB 119 118 -1 -1 -1 18.8 18.7 -0.1 -0.5 0 N 12.5 12.4 -0.1 -0.7 0 N
98 55.5 54.4 -1.1 -1.9 -3 SB 105 106 1 1 1 57.9 56.6 -1.3 -2.2 -3 SB 108 108 0 0 0 18.4 18.4 0.0 0.0 0 N 12.3 12.3 0.0 -0.2 0 N
99 68.7 72.5 3.8 5.6 10 SA 143 152 9 7 5 72.9 77.1 4.3 5.9 11 SA 150 161 11 7 6 19.3 19.7 0.4 2.3 1 N 12.9 13.2 0.3 2.1 1 N
100 65.3 68.3 3.0 4.6 8 SA 134 157 23 17 11 69.0 72.6 3.6 5.2 9 SA 140 166 26 18 13 19.1 19.4 0.3 1.7 1 N 12.7 13.0 0.2 1.8 1 N
101 64.5 65.2 0.7 1.1 2 SA 129 147 18 14 9 68.2 69.1 0.9 1.3 2 SA 136 155 18 14 9 19.0 19.1 0.1 0.6 0 N 12.7 12.7 0.1 0.5 0 N
102 70.1 69.9 -0.2 -0.3 -1 MB 132 148 16 12 8 74.5 73.9 -0.6 -0.8 -1 MB 137 156 19 14 9 19.4 19.5 0.1 0.6 0 N 12.9 13.0 0.0 0.2 0 N
103 75.2 82.1 6.9 9.2 17 SA 142 157 15 10 7 78.7 85.7 7.0 8.9 17 SA 148 162 14 10 7 20.5 21.8 1.4 6.7 4 N 13.7 14.7 1.1 7.9 4 N
104 73.7 78.2 4.5 6.0 11 SA 148 173 26 17 13 77.3 81.3 4.0 5.2 10 SA 155 179 24 15 12 20.3 21.6 1.2 6.1 4 N 13.6 14.6 1.0 7.6 4 N
105 74.8 84.0 9.2 12.3 23 SA 169 205 36 21 18 77.9 86.8 8.9 11.4 22 SA 172 210 38 22 19 20.5 22.8 2.3 11.3 7 SlA 13.7 15.6 1.9 14.0 8 SlA
106 76.4 87.2 10.8 14.1 27 SA 162 200 38 23 19 79.6 90.6 11.0 13.8 28 SA 165 202 37 23 19 20.7 22.9 2.3 10.9 7 SlA 13.8 15.6 1.8 13.1 7 SlA
107 74.4 69.8 -4.5 -6.1 -11 SB 172 157 -15 -9 -7 79.0 74.3 -4.7 -6.0 -12 SB 182 167 -15 -8 -7 20.1 19.7 -0.5 -2.3 -1 N 13.4 13.1 -0.3 -2.3 -1 N
108 73.3 69.6 -3.7 -5.1 -9 SB 169 158 -11 -7 -6 78.0 74.2 -3.8 -4.9 -10 SB 181 168 -13 -7 -7 20.1 19.7 -0.4 -2.1 -1 N 13.4 13.1 -0.3 -2.2 -1 N
109 77.4 75.5 -1.9 -2.5 -5 SB 157 157 0 0 0 82.7 81.0 -1.6 -2.0 -4 SB 166 166 0 0 0 20.4 20.1 -0.4 -1.7 -1 N 13.6 13.4 -0.3 -1.9 -1 N
110 78.3 77.4 -0.9 -1.1 -2 SB 162 165 4 2 2 82.9 82.3 -0.6 -0.8 -2 SB 168 173 6 3 3 20.6 20.4 -0.1 -0.7 0 N 13.6 13.5 -0.1 -0.5 0 N
111 76.8 77.3 0.5 0.6 1 MA 179 190 11 6 5 81.3 82.5 1.2 1.4 3 SA 190 203 12 7 6 20.5 20.4 -0.1 -0.5 0 N 13.5 13.5 0.0 -0.3 0 N
112 74.3 74.0 -0.3 -0.4 -1 MB 172 181 9 5 5 78.6 78.8 0.2 0.3 1 MA 182 193 10 6 5 20.2 20.1 -0.1 -0.7 0 N 13.4 13.3 -0.1 -0.5 0 N
113 77.9 75.9 -2.0 -2.6 -5 SB 158 169 11 7 6 82.6 80.6 -2.0 -2.5 -5 SB 165 177 12 7 6 20.5 20.3 -0.2 -1.0 -1 N 13.5 13.4 -0.1 -0.8 0 N
114 70.4 67.9 -2.4 -3.5 -6 SB 150 144 -5 -4 -3 74.2 71.5 -2.7 -3.6 -7 SB 157 152 -6 -4 -3 19.9 19.8 -0.2 -0.9 -1 N 13.2 13.1 -0.1 -0.9 0 N
115 67.5 65.2 -2.4 -3.5 -6 SB 140 135 -5 -4 -3 71.2 68.5 -2.7 -3.8 -7 SB 146 141 -5 -3 -2 19.6 19.5 -0.2 -0.8 0 N 13.0 12.9 -0.1 -0.8 0 N
116 84.7 79.8 -4.9 -5.8 -12 SB 176 171 -5 -3 -3 90.7 84.2 -6.5 -7.1 -16 SB 186 177 -9 -5 -4 21.2 21.0 -0.2 -0.8 -1 N 14.0 13.9 -0.1 -0.9 0 N
117 83.8 80.2 -3.6 -4.3 -9 SB 182 172 -10 -6 -5 89.5 84.6 -4.9 -5.5 -12 SB 190 178 -12 -6 -6 21.2 21.1 -0.1 -0.5 0 N 14.1 14.0 -0.1 -0.5 0 N
118 82.2 78.1 -4.1 -5.0 -10 SB 220 207 -13 -6 -6 87.7 82.4 -5.3 -6.0 -13 SB 236 220 -16 -7 -8 21.0 20.8 -0.2 -0.9 -1 N 14.0 13.8 -0.1 -0.8 0 N
119 83.5 76.3 -7.2 -8.6 -18 SB 170 155 -15 -9 -8 89.5 79.9 -9.6 -10.7 -24 SB 179 160 -19 -11 -9 20.9 20.7 -0.2 -1.0 -1 N 13.9 13.7 -0.1 -1.1 -1 N
120 77.1 74.3 -2.8 -3.7 -7 SB 199 183 -16 -8 -8 82.1 77.6 -4.5 -5.4 -11 SB 212 192 -21 -10 -10 20.3 20.5 0.2 1.0 1 N 13.5 13.6 0.1 1.0 1 N
121 76.0 74.6 -1.3 -1.7 -3 SB 194 193 0 0 0 80.8 78.3 -2.6 -3.2 -6 SB 209 203 -6 -3 -3 20.2 20.5 0.3 1.5 1 N 13.4 13.6 0.2 1.7 1 N
122 82.0 76.4 -5.6 -6.8 -14 SB 168 166 -2 -1 -1 87.9 80.4 -7.5 -8.6 -19 SB 178 169 -9 -5 -5 20.7 20.6 -0.1 -0.4 0 N 13.7 13.7 0.0 -0.2 0 N
123 66.0 62.6 -3.4 -5.2 -8 SB 129 125 -4 -3 -2 68.4 64.8 -3.6 -5.3 -9 SB 135 128 -7 -5 -3 19.7 19.5 -0.2 -1.2 -1 N 13.1 13.0 -0.1 -0.8 0 N
124 63.8 61.3 -2.6 -4.0 -6 SB 142 133 -9 -6 -4 66.2 63.5 -2.7 -4.1 -7 SB 147 137 -10 -7 -5 19.5 19.3 -0.2 -0.9 -1 N 12.9 12.9 -0.1 -0.6 0 N
125 64.2 61.1 -3.1 -4.9 -8 SB 145 140 -5 -3 -2 66.6 63.3 -3.3 -5.0 -8 SB 149 143 -6 -4 -3 19.6 19.3 -0.2 -1.1 -1 N 13.0 12.9 -0.1 -0.8 0 N
126 66.0 62.8 -3.2 -4.8 -8 SB 130 133 3 3 2 68.3 64.9 -3.5 -5.1 -9 SB 135 136 1 1 1 19.7 19.5 -0.2 -1.0 -1 N 13.1 13.0 -0.1 -0.6 0 N
127 88.5 85.1 -3.4 -3.9 -9 SB 219 209 -10 -5 -5 93.3 89.6 -3.7 -4.0 -9 SB 228 217 -11 -5 -6 22.1 21.7 -0.4 -1.9 -1 N 14.6 14.3 -0.3 -1.9 -1 N
128 64.9 62.0 -2.9 -4.5 -7 SB 124 120 -4 -3 -2 68.3 65.2 -3.2 -4.6 -8 SB 130 125 -5 -4 -2 19.4 19.2 -0.2 -0.9 -1 N 12.9 12.8 -0.1 -0.8 0 N
129 64.8 61.5 -3.3 -5.0 -8 SB 127 120 -7 -5 -3 68.2 64.6 -3.6 -5.3 -9 SB 132 125 -7 -6 -4 19.3 19.2 -0.2 -1.0 -1 N 12.9 12.7 -0.1 -0.9 0 N
130 64.5 61.3 -3.2 -5.0 -8 SB 126 121 -5 -4 -2 67.9 64.4 -3.5 -5.1 -9 SB 132 127 -4 -3 -2 19.3 19.1 -0.2 -1.0 -1 N 12.8 12.7 -0.1 -0.9 0 N
131 70.3 65.6 -4.8 -6.8 -12 SB 152 142 -10 -7 -5 73.1 68.2 -4.8 -6.6 -12 SB 158 146 -12 -8 -6 20.2 19.7 -0.5 -2.3 -1 N 13.4 13.1 -0.3 -2.1 -1 N
132 67.5 64.5 -3.0 -4.4 -7 SB 164 150 -14 -9 -7 70.3 67.2 -3.1 -4.4 -8 SB 168 154 -14 -8 -7 19.9 19.6 -0.2 -1.2 -1 N 13.2 13.0 -0.1 -1.0 -1 N
133 63.6 63.1 -0.5 -0.9 -1 MB 139 134 -5 -3 -2 66.7 65.5 -1.2 -1.8 -3 SB 146 140 -7 -5 -3 19.3 19.5 0.2 0.9 1 N 12.9 13.0 0.1 1.1 1 N
134 63.3 63.4 0.1 0.2 0 N 139 143 4 3 2 66.3 65.7 -0.6 -0.9 -2 SB 146 147 0 0 0 19.3 19.6 0.2 1.2 1 N 12.8 13.0 0.2 1.5 1 N
135 64.8 61.8 -3.0 -4.6 -7 SB 147 137 -11 -7 -5 67.7 64.5 -3.3 -4.8 -8 SB 153 140 -13 -8 -6 19.5 19.3 -0.2 -1.0 -1 N 12.9 12.8 -0.1 -0.9 0 N
136 64.1 61.5 -2.5 -4.0 -6 SB 147 135 -13 -9 -6 66.9 64.2 -2.8 -4.1 -7 SB 151 139 -12 -8 -6 19.5 19.3 -0.2 -0.8 -1 N 12.9 12.8 -0.1 -0.7 0 N
137 61.1 58.4 -2.7 -4.5 -7 SB 128 121 -7 -5 -3 63.7 60.6 -3.0 -4.8 -8 SB 133 124 -8 -6 -4 19.2 19.0 -0.2 -0.9 -1 N 12.7 12.7 -0.1 -0.7 0 N
138 60.4 58.0 -2.4 -3.9 -6 SB 127 119 -9 -7 -4 62.9 60.2 -2.6 -4.2 -7 SB 133 122 -12 -9 -6 19.1 19.0 -0.1 -0.7 0 N 12.7 12.6 -0.1 -0.5 0 N
139 63.0 61.3 -1.6 -2.6 -4 SB 140 132 -8 -5 -4 65.7 63.9 -1.7 -2.6 -4 SB 145 137 -8 -6 -4 19.4 19.3 -0.1 -0.5 0 N 12.9 12.8 0.0 -0.4 0 N
140 62.8 61.4 -1.4 -2.3 -4 SB 139 132 -6 -5 -3 65.5 63.9 -1.5 -2.3 -4 SB 144 137 -7 -5 -3 19.4 19.3 -0.1 -0.4 0 N 12.8 12.8 0.0 -0.3 0 N
141 59.0 57.8 -1.2 -2.1 -3 SB 122 117 -6 -5 -3 61.4 60.0 -1.4 -2.3 -4 SB 126 119 -7 -6 -4 19.0 19.0 0.0 -0.2 0 N 12.6 12.6 0.0 -0.1 0 N
142 59.0 58.0 -0.9 -1.6 -2 SB 121 116 -5 -4 -2 61.2 60.1 -1.1 -1.8 -3 SB 125 120 -5 -4 -3 19.0 19.0 0.0 -0.1 0 N 12.6 12.7 0.0 0.1 0 N
143 63.5 62.3 -1.2 -2.0 -3 SB 138 133 -5 -4 -2 66.2 64.7 -1.5 -2.2 -4 SB 141 137 -5 -3 -2 19.5 19.5 0.0 0.0 0 N 12.9 13.0 0.0 0.3 0 N
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 52 of 55 March 2016
‘Official’ Annual Mean NO2 Official 99.8th
%iles of 1h NO2 Sensitivity Test Annual Mean NO2 Sensitivity 99.8h %iles 1h NO2 Annual Mean PM10 Annual Mean PM2.5
R DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 D
144 62.0 60.9 -1.1 -1.7 -3 SB 136 133 -3 -2 -2 64.5 63.3 -1.2 -1.8 -3 SB 140 136 -5 -3 -2 19.3 19.3 0.0 -0.2 0 N 12.8 12.8 0.0 0.0 0 N
145 59.2 58.4 -0.8 -1.4 -2 SB 120 115 -4 -4 -2 61.5 60.3 -1.1 -1.8 -3 SB 123 119 -4 -3 -2 19.1 19.1 0.0 0.2 0 N 12.7 12.7 0.1 0.4 0 N
146 59.1 58.3 -0.8 -1.3 -2 SB 122 119 -3 -2 -1 61.3 60.3 -1.1 -1.7 -3 SB 126 121 -5 -4 -2 19.1 19.1 0.0 0.2 0 N 12.7 12.7 0.1 0.4 0 N
147 60.8 59.9 -0.9 -1.4 -2 SB 119 117 -2 -1 -1 62.5 61.7 -0.8 -1.3 -2 SB 121 118 -3 -2 -1 19.4 19.3 -0.1 -0.3 0 N 12.9 12.9 0.0 -0.2 0 N
148 58.3 57.5 -0.8 -1.4 -2 SB 122 119 -3 -3 -2 60.4 59.5 -1.0 -1.6 -2 SB 124 121 -3 -2 -1 19.0 19.0 0.0 0.0 0 N 12.6 12.6 0.0 0.1 0 N
149 58.8 57.3 -1.6 -2.6 -4 SB 123 119 -4 -3 -2 61.1 59.4 -1.7 -2.8 -4 SB 128 121 -7 -6 -4 19.0 18.9 -0.1 -0.4 0 N 12.6 12.6 0.0 -0.3 0 N
150 60.6 57.8 -2.8 -4.6 -7 SB 130 123 -6 -5 -3 62.9 60.0 -3.0 -4.7 -7 SB 134 126 -8 -6 -4 19.2 19.0 -0.2 -1.0 -1 N 12.7 12.6 -0.1 -0.8 0 N
151 67.3 62.7 -4.6 -6.9 -12 SB 122 122 0 0 0 70.2 65.4 -4.8 -6.8 -12 SB 126 126 0 0 0 19.7 19.4 -0.3 -1.7 -1 N 13.1 12.9 -0.2 -1.4 -1 N
152 66.6 63.2 -3.4 -5.1 -8 SB 135 130 -6 -4 -3 69.4 65.8 -3.6 -5.2 -9 SB 138 133 -5 -4 -3 19.7 19.5 -0.2 -1.1 -1 N 13.1 13.0 -0.1 -0.7 0 N
153 66.8 62.3 -4.5 -6.7 -11 SB 135 126 -10 -7 -5 69.6 65.0 -4.6 -6.6 -12 SB 137 128 -10 -7 -5 19.7 19.3 -0.4 -1.8 -1 N 13.1 12.9 -0.2 -1.5 -1 N
154 67.6 62.2 -5.4 -8.0 -14 SB 123 116 -7 -6 -3 70.5 65.0 -5.6 -7.9 -14 SB 128 121 -7 -5 -4 19.7 19.3 -0.4 -2.2 -1 N 13.1 12.8 -0.3 -2.0 -1 N
155 87.3 74.5 -12.8 -14.7 -32 SB 169 141 -28 -17 -14 91.8 78.4 -13.4 -14.6 -34 SB 174 146 -29 -16 -14 21.2 20.4 -0.8 -3.7 -2 N 14.1 13.6 -0.5 -3.8 -2 N
156 88.0 75.2 -12.9 -14.6 -32 SB 189 150 -39 -21 -19 92.7 79.2 -13.5 -14.6 -34 SB 193 154 -39 -20 -19 21.6 20.5 -1.1 -5.1 -3 N 14.4 13.6 -0.8 -5.4 -3 N
157 80.0 73.6 -6.4 -8.0 -16 SB 203 179 -24 -12 -12 83.8 77.5 -6.2 -7.4 -16 SB 209 186 -22 -11 -11 20.8 20.3 -0.4 -2.2 -1 N 13.8 13.5 -0.3 -2.2 -1 N
158 80.5 72.1 -8.3 -10.4 -21 SB 200 169 -31 -16 -16 84.4 75.9 -8.6 -10.1 -21 SB 205 176 -30 -14 -15 20.7 20.2 -0.5 -2.4 -2 N 13.8 13.4 -0.3 -2.4 -1 N
159 67.4 62.4 -4.9 -7.3 -12 SB 142 126 -17 -12 -8 69.9 64.8 -5.0 -7.2 -13 SB 147 131 -16 -11 -8 19.8 19.4 -0.4 -1.8 -1 N 13.2 12.9 -0.2 -1.6 -1 N
160 67.5 62.7 -4.8 -7.1 -12 SB 155 140 -15 -10 -8 69.9 65.0 -4.8 -6.9 -12 SB 158 144 -14 -9 -7 19.8 19.5 -0.4 -1.8 -1 N 13.2 13.0 -0.2 -1.6 -1 N
161 69.5 63.2 -6.3 -9.1 -16 SB 132 120 -12 -9 -6 71.6 65.2 -6.4 -8.9 -16 SB 136 123 -13 -9 -6 20.1 19.6 -0.6 -2.8 -2 N 13.4 13.0 -0.3 -2.4 -1 N
162 69.3 62.8 -6.5 -9.4 -16 SB 147 132 -15 -10 -7 71.4 64.8 -6.6 -9.2 -16 SB 149 135 -14 -9 -7 20.2 19.6 -0.6 -3.0 -2 N 13.4 13.0 -0.3 -2.6 -1 N
163 66.4 61.9 -4.5 -6.8 -11 SB 156 139 -18 -11 -9 68.5 63.9 -4.6 -6.8 -12 SB 159 142 -17 -11 -8 19.8 19.5 -0.4 -1.8 -1 N 13.2 13.0 -0.2 -1.5 -1 N
164 66.8 62.5 -4.3 -6.4 -11 SB 146 129 -17 -12 -9 68.9 64.4 -4.4 -6.4 -11 SB 149 132 -17 -12 -9 19.8 19.5 -0.3 -1.6 -1 N 13.2 13.0 -0.2 -1.3 -1 N
165 61.9 58.8 -3.1 -5.0 -8 SB 123 114 -10 -8 -5 63.8 60.7 -3.1 -4.9 -8 SB 126 117 -9 -7 -5 19.4 19.2 -0.2 -1.2 -1 N 12.9 12.8 -0.1 -0.9 0 N
166 61.4 58.0 -3.3 -5.4 -8 SB 136 124 -12 -9 -6 63.2 59.9 -3.3 -5.2 -8 SB 137 125 -12 -9 -6 19.4 19.1 -0.3 -1.3 -1 N 12.9 12.7 -0.1 -1.1 -1 N
167 61.0 57.7 -3.2 -5.3 -8 SB 135 123 -11 -8 -6 62.8 59.6 -3.2 -5.1 -8 SB 135 124 -11 -8 -5 19.3 19.1 -0.3 -1.3 -1 N 12.9 12.7 -0.1 -1.0 -1 N
168 61.5 58.5 -3.0 -4.9 -8 SB 122 113 -9 -7 -4 63.4 60.4 -3.0 -4.7 -8 SB 124 116 -9 -7 -4 19.4 19.1 -0.2 -1.1 -1 N 12.9 12.8 -0.1 -0.9 0 N
169 61.1 59.5 -1.5 -2.5 -4 SB 114 111 -3 -3 -2 64.1 62.2 -1.8 -2.9 -5 SB 118 115 -4 -3 -2 19.0 19.0 0.0 0.0 0 N 12.7 12.7 0.0 0.0 0 N
170 61.5 59.4 -2.2 -3.5 -5 SB 115 112 -3 -3 -2 64.6 62.1 -2.5 -3.8 -6 SB 119 115 -5 -4 -2 19.1 19.0 -0.1 -0.3 0 N 12.7 12.6 0.0 -0.3 0 N
171 62.6 59.2 -3.4 -5.5 -9 SB 119 112 -7 -6 -4 65.8 62.0 -3.7 -5.7 -9 SB 123 115 -8 -7 -4 19.1 19.0 -0.1 -0.8 0 N 12.7 12.6 -0.1 -0.8 0 N
172 64.5 60.2 -4.3 -6.7 -11 SB 124 113 -10 -8 -5 67.8 63.2 -4.6 -6.8 -12 SB 128 118 -10 -7 -5 19.3 19.1 -0.2 -1.0 -1 N 12.8 12.7 -0.1 -1.0 -1 N
173 86.6 72.6 -14.0 -16.2 -35 SB 178 142 -36 -20 -18 90.8 76.5 -14.3 -15.8 -36 SB 183 146 -37 -20 -18 21.0 20.1 -0.9 -4.2 -3 N 14.0 13.3 -0.7 -4.7 -3 N
174 85.7 72.4 -13.3 -15.5 -33 SB 185 146 -39 -21 -20 90.4 76.3 -14.1 -15.5 -35 SB 189 150 -39 -21 -20 21.0 20.2 -0.8 -4.0 -3 N 14.0 13.4 -0.6 -4.5 -3 N
175 77.3 71.1 -6.3 -8.1 -16 SB 203 180 -23 -11 -12 81.4 74.9 -6.5 -7.9 -16 SB 211 188 -23 -11 -11 20.2 20.0 -0.3 -1.3 -1 N 13.5 13.3 -0.2 -1.6 -1 N
176 77.2 69.2 -8.0 -10.3 -20 SB 200 164 -36 -18 -18 81.0 72.9 -8.1 -10.0 -20 SB 209 172 -37 -18 -19 20.2 19.8 -0.4 -2.2 -1 N 13.5 13.1 -0.3 -2.4 -1 N
177 59.7 55.4 -4.3 -7.2 -11 SB 126 117 -9 -7 -5 62.4 57.9 -4.5 -7.1 -11 SB 131 119 -12 -9 -6 19.0 18.7 -0.3 -1.7 -1 N 12.6 12.4 -0.2 -1.6 -1 N
178 60.9 56.4 -4.5 -7.4 -11 SB 120 111 -9 -7 -4 63.4 58.7 -4.7 -7.4 -12 SB 124 114 -10 -8 -5 19.2 18.8 -0.4 -1.9 -1 N 12.7 12.5 -0.2 -1.7 -1 N
179 58.6 55.6 -3.0 -5.1 -7 SB 131 117 -14 -11 -7 61.1 57.9 -3.2 -5.3 -8 SB 134 120 -14 -10 -7 18.9 18.7 -0.2 -1.1 -1 N 12.6 12.5 -0.1 -1.0 0 N
180 56.9 53.9 -3.0 -5.3 -8 SB 124 112 -11 -9 -6 59.5 56.3 -3.2 -5.3 -8 SB 129 116 -13 -10 -7 18.8 18.6 -0.2 -1.1 -1 N 12.5 12.3 -0.1 -1.1 -1 N
181 54.7 52.6 -2.1 -3.8 -5 SB 116 108 -8 -7 -4 57.0 54.8 -2.3 -3.9 -6 SB 119 110 -9 -8 -4 18.6 18.5 -0.1 -0.6 0 N 12.4 12.3 -0.1 -0.6 0 N
182 54.0 52.5 -1.5 -2.9 -4 SB 109 103 -6 -6 -3 56.3 54.6 -1.7 -3.0 -4 SB 111 105 -6 -5 -3 18.5 18.5 -0.1 -0.4 0 N 12.3 12.3 0.0 -0.4 0 N
183 53.7 52.3 -1.5 -2.7 -4 SB 108 102 -6 -6 -3 56.0 54.4 -1.6 -2.9 -4 SB 110 104 -6 -5 -3 18.5 18.4 -0.1 -0.4 0 N 12.3 12.3 0.0 -0.3 0 N
184 53.6 51.9 -1.7 -3.2 -4 SB 112 105 -6 -6 -3 55.9 54.0 -1.9 -3.4 -5 SB 114 107 -7 -6 -3 18.5 18.4 -0.1 -0.5 0 N 12.3 12.3 -0.1 -0.5 0 N
185 53.1 52.0 -1.1 -2.1 -3 SB 106 101 -4 -4 -2 55.6 54.4 -1.2 -2.1 -3 SB 107 104 -3 -3 -2 18.4 18.4 -0.1 -0.3 0 N 12.3 12.2 0.0 -0.3 0 N
186 56.7 53.7 -3.0 -5.3 -8 SB 112 108 -4 -4 -2 59.4 56.2 -3.1 -5.3 -8 SB 116 111 -6 -5 -3 18.7 18.5 -0.2 -1.1 -1 N 12.4 12.3 -0.1 -1.0 -1 N
187 78.2 71.2 -7.0 -8.9 -17 SB 161 141 -20 -12 -10 82.6 74.8 -7.8 -9.4 -19 SB 168 145 -23 -14 -11 20.4 20.0 -0.3 -1.7 -1 N 13.5 13.3 -0.2 -1.7 -1 N
188 72.3 66.5 -5.7 -7.9 -14 SB 182 156 -26 -14 -13 76.2 69.9 -6.3 -8.3 -16 SB 189 163 -26 -14 -13 19.8 19.6 -0.3 -1.3 -1 N 13.2 13.0 -0.2 -1.3 -1 N
189 77.4 71.5 -5.9 -7.7 -15 SB 152 140 -12 -8 -6 81.8 74.9 -6.9 -8.5 -17 SB 159 143 -15 -10 -8 20.3 20.1 -0.2 -1.0 -1 N 13.4 13.3 -0.2 -1.2 -1 N
190 71.6 66.3 -5.3 -7.4 -13 SB 177 156 -21 -12 -11 75.6 69.4 -6.2 -8.2 -15 SB 187 163 -24 -13 -12 19.7 19.5 -0.2 -1.0 -1 N 13.1 13.0 -0.1 -1.1 -1 N
191 61.4 58.0 -3.4 -5.6 -9 SB 118 108 -9 -8 -5 64.6 60.9 -3.7 -5.8 -9 SB 121 112 -9 -7 -5 19.0 18.8 -0.2 -0.8 0 N 12.6 12.5 -0.1 -0.8 0 N
192 60.0 56.8 -3.1 -5.2 -8 SB 113 106 -7 -7 -4 63.1 59.7 -3.4 -5.4 -8 SB 118 110 -8 -7 -4 18.9 18.7 -0.1 -0.8 0 N 12.5 12.5 -0.1 -0.8 0 N
193 77.8 71.9 -5.8 -7.5 -15 SB 156 144 -12 -7 -6 82.2 75.3 -6.9 -8.4 -17 SB 162 147 -15 -9 -7 20.3 20.1 -0.2 -0.9 -1 N 13.5 13.3 -0.1 -1.1 -1 N
194 61.7 58.7 -3.0 -4.9 -8 SB 118 110 -8 -7 -4 64.8 61.4 -3.3 -5.1 -8 SB 121 113 -8 -7 -4 19.0 18.9 -0.1 -0.6 0 N 12.7 12.6 -0.1 -0.6 0 N
195 61.4 58.0 -3.5 -5.6 -9 SB 112 105 -7 -6 -4 64.4 60.7 -3.7 -5.7 -9 SB 116 108 -8 -7 -4 19.0 18.8 -0.2 -0.9 -1 N 12.7 12.5 -0.1 -1.0 0 N
196 62.4 58.7 -3.7 -6.0 -9 SB 115 107 -9 -8 -4 65.5 61.5 -4.1 -6.2 -10 SB 120 109 -11 -9 -6 19.1 18.9 -0.2 -0.9 -1 N 12.7 12.6 -0.1 -1.0 -1 N
197 68.2 63.0 -5.2 -7.6 -13 SB 152 135 -17 -11 -8 72.3 67.0 -5.3 -7.4 -13 SB 161 143 -18 -11 -9 19.2 18.8 -0.4 -1.9 -1 N 12.8 12.5 -0.3 -2.1 -1 N
198 76.1 67.6 -8.5 -11.2 -21 SB 153 138 -15 -10 -8 81.0 71.6 -9.4 -11.6 -23 SB 161 145 -16 -10 -8 19.8 19.2 -0.5 -2.6 -2 N 13.2 12.8 -0.4 -3.1 -2 N
199 57.2 54.0 -3.2 -5.6 -8 SB 108 102 -6 -6 -3 59.7 56.5 -3.2 -5.4 -8 SB 111 105 -6 -5 -3 18.5 18.3 -0.2 -1.2 -1 N 12.4 12.2 -0.1 -1.2 -1 N
200 57.3 53.6 -3.7 -6.4 -9 SB 110 101 -8 -7 -4 59.7 56.1 -3.6 -6.1 -9 SB 112 104 -8 -7 -4 18.6 18.3 -0.3 -1.5 -1 N 12.4 12.2 -0.2 -1.5 -1 N
201 54.6 52.0 -2.6 -4.8 -7 SB 103 98 -4 -4 -2 57.0 54.6 -2.4 -4.2 -6 SB 105 101 -4 -3 -2 18.3 18.2 -0.1 -0.6 0 N 12.2 12.1 -0.1 -0.6 0 N
202 54.0 51.7 -2.3 -4.3 -6 SB 102 99 -3 -3 -2 56.3 54.2 -2.1 -3.7 -5 SB 105 100 -5 -4 -2 18.3 18.2 -0.1 -0.5 0 N 12.2 12.1 -0.1 -0.5 0 N
203 55.5 52.5 -3.0 -5.5 -8 SB 102 98 -4 -4 -2 57.7 55.1 -2.7 -4.6 -7 SB 106 99 -7 -7 -4 18.4 18.3 -0.2 -0.8 0 N 12.3 12.2 -0.1 -0.8 0 N
204 56.0 53.0 -3.0 -5.4 -8 SB 105 100 -5 -5 -3 58.2 55.5 -2.6 -4.5 -7 SB 108 101 -7 -7 -4 18.5 18.3 -0.2 -0.8 0 N 12.3 12.2 -0.1 -0.8 0 N
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 53 of 55 March 2016
‘Official’ Annual Mean NO2 Official 99.8th
%iles of 1h NO2 Sensitivity Test Annual Mean NO2 Sensitivity 99.8h %iles 1h NO2 Annual Mean PM10 Annual Mean PM2.5
R DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 D
205 56.0 52.8 -3.3 -5.8 -8 SB 105 100 -5 -5 -2 58.3 55.5 -2.9 -4.9 -7 SB 108 101 -7 -6 -3 18.4 18.3 -0.2 -0.9 -1 N 12.3 12.2 -0.1 -0.8 0 N
206 56.0 52.6 -3.4 -6.1 -9 SB 103 99 -4 -3 -2 58.3 55.3 -3.0 -5.2 -8 SB 104 100 -4 -4 -2 18.4 18.3 -0.2 -1.0 -1 N 12.3 12.2 -0.1 -1.0 0 N
207 58.3 54.2 -4.1 -7.1 -10 SB 108 100 -8 -7 -4 60.6 56.7 -3.9 -6.4 -10 SB 113 102 -11 -10 -6 18.7 18.3 -0.3 -1.7 -1 N 12.5 12.3 -0.2 -1.6 -1 N
208 58.5 54.7 -3.8 -6.5 -10 SB 108 101 -8 -7 -4 60.9 57.2 -3.6 -6.0 -9 SB 111 102 -9 -8 -4 18.6 18.4 -0.3 -1.5 -1 N 12.5 12.3 -0.2 -1.5 -1 N
209 56.7 53.9 -2.9 -5.0 -7 SB 107 101 -6 -5 -3 59.2 56.5 -2.7 -4.6 -7 SB 111 102 -9 -8 -4 18.5 18.3 -0.2 -0.9 -1 N 12.3 12.2 -0.1 -0.9 0 N
210 72.4 69.2 -3.2 -4.4 -8 SB 146 138 -9 -6 -4 77.0 73.7 -3.3 -4.2 -8 SB 154 146 -8 -5 -4 19.6 19.4 -0.2 -1.2 -1 N 13.1 13.0 -0.2 -1.2 -1 N
211 73.5 70.3 -3.2 -4.3 -8 SB 148 144 -4 -2 -2 78.0 74.7 -3.3 -4.2 -8 SB 155 152 -3 -2 -1 19.6 19.5 -0.1 -0.5 0 N 13.1 13.0 -0.1 -0.5 0 N
212 68.5 66.5 -1.9 -2.8 -5 SB 148 148 0 0 0 72.5 70.5 -2.0 -2.7 -5 SB 158 156 -2 -1 -1 19.3 19.2 0.0 -0.2 0 N 12.9 12.9 0.0 -0.1 0 N
213 68.5 66.2 -2.3 -3.4 -6 SB 148 143 -5 -3 -2 72.6 70.4 -2.1 -2.9 -5 SB 157 154 -3 -2 -2 19.3 19.1 -0.2 -0.9 -1 N 12.9 12.8 -0.1 -0.9 0 N
214 59.4 56.6 -2.8 -4.7 -7 SB 108 105 -4 -4 -2 61.3 59.1 -2.2 -3.5 -5 SB 111 108 -3 -3 -2 18.9 18.8 -0.1 -0.3 0 N 12.6 12.6 0.0 -0.1 0 N
215 59.1 56.2 -3.0 -5.0 -7 SB 107 103 -4 -3 -2 61.2 58.8 -2.3 -3.8 -6 SB 108 105 -3 -3 -2 18.8 18.7 -0.1 -0.4 0 N 12.6 12.5 0.0 -0.2 0 N
216 59.8 57.8 -2.0 -3.4 -5 SB 118 113 -5 -4 -2 61.7 60.3 -1.4 -2.3 -4 SB 118 114 -5 -4 -2 18.9 18.9 0.0 0.1 0 N 12.6 12.7 0.1 0.6 0 N
217 61.3 58.5 -2.8 -4.5 -7 SB 113 110 -3 -2 -1 63.8 61.5 -2.4 -3.7 -6 SB 117 114 -3 -3 -2 18.9 18.8 -0.1 -0.5 0 N 12.6 12.6 0.0 -0.2 0 N
218 62.1 59.7 -2.5 -3.9 -6 SB 126 119 -7 -6 -4 64.6 62.6 -2.0 -3.0 -5 SB 128 123 -5 -4 -3 19.0 19.0 0.0 -0.1 0 N 12.7 12.7 0.0 0.3 0 N
219 76.8 73.1 -3.8 -4.9 -9 SB 153 146 -7 -4 -3 81.3 77.6 -3.7 -4.6 -9 SB 161 155 -6 -4 -3 20.1 20.0 -0.1 -0.3 0 N 13.4 13.4 0.0 0.3 0 N
220 76.7 73.6 -3.1 -4.0 -8 SB 164 170 5 3 3 80.8 78.0 -2.8 -3.4 -7 SB 167 176 9 5 4 20.1 20.1 0.0 0.1 0 N 13.4 13.5 0.1 0.8 0 N
221 71.3 69.7 -1.6 -2.2 -4 SB 157 153 -4 -2 -2 75.3 73.9 -1.4 -1.9 -4 SB 164 163 -1 -1 -1 19.6 19.7 0.1 0.5 0 N 13.1 13.2 0.1 1.0 1 N
222 72.7 70.3 -2.4 -3.3 -6 SB 169 166 -3 -2 -1 76.4 74.3 -2.2 -2.8 -5 SB 175 175 0 0 0 19.8 19.8 0.0 0.2 0 N 13.2 13.3 0.1 0.9 0 N
223 63.5 60.3 -3.2 -5.1 -8 SB 117 111 -5 -4 -3 66.3 62.7 -3.6 -5.5 -9 SB 120 113 -7 -6 -3 19.0 19.0 -0.1 -0.4 0 N 12.7 12.7 0.0 -0.3 0 N
224 64.1 60.6 -3.6 -5.6 -9 SB 129 122 -7 -5 -3 67.0 62.9 -4.0 -6.0 -10 SB 131 123 -7 -6 -4 19.1 19.0 -0.1 -0.7 0 N 12.8 12.7 -0.1 -0.6 0 N
225 83.9 74.3 -9.6 -11.5 -24 SB 164 139 -25 -15 -12 87.8 77.4 -10.5 -11.9 -26 SB 169 143 -26 -16 -13 20.8 20.5 -0.3 -1.4 -1 N 13.9 13.6 -0.3 -1.8 -1 N
226 82.3 75.0 -7.3 -8.9 -18 SB 182 155 -27 -15 -13 86.3 78.2 -8.0 -9.3 -20 SB 183 156 -27 -15 -13 20.7 20.6 -0.1 -0.3 0 N 13.8 13.7 -0.1 -0.7 0 N
227 78.3 72.5 -5.7 -7.3 -14 SB 199 169 -30 -15 -15 81.9 75.5 -6.3 -7.7 -16 SB 206 174 -32 -16 -16 20.4 20.4 0.0 -0.2 0 N 13.6 13.5 -0.1 -0.6 0 N
228 70.1 66.5 -3.6 -5.1 -9 SB 170 154 -16 -9 -8 73.5 69.5 -4.0 -5.5 -10 SB 175 159 -16 -9 -8 19.7 19.7 0.0 0.0 0 N 13.1 13.1 0.0 -0.3 0 N
229 63.7 60.2 -3.5 -5.5 -9 SB 128 117 -11 -8 -5 66.3 62.4 -3.9 -5.9 -10 SB 133 121 -12 -9 -6 19.4 19.2 -0.1 -0.7 0 N 12.9 12.8 -0.1 -0.6 0 N
230 60.5 58.5 -2.0 -3.3 -5 SB 120 112 -8 -7 -4 62.9 60.6 -2.3 -3.7 -6 SB 124 115 -9 -7 -4 19.1 19.1 0.0 -0.1 0 N 12.7 12.7 0.0 0.0 0 N
231 62.0 59.4 -2.6 -4.1 -6 SB 132 122 -10 -8 -5 64.5 61.4 -3.1 -4.7 -8 SB 136 123 -13 -10 -7 19.3 19.2 -0.1 -0.3 0 N 12.8 12.8 0.0 -0.3 0 N
232 58.0 57.5 -0.5 -0.8 -1 MB 111 107 -4 -3 -2 60.1 59.4 -0.6 -1.1 -2 SB 113 108 -4 -4 -2 19.0 19.0 0.1 0.3 0 N 12.6 12.7 0.1 0.5 0 N
233 61.5 61.7 0.2 0.3 0 N 120 116 -4 -3 -2 63.5 63.4 -0.1 -0.1 0 N 121 116 -5 -4 -2 19.4 19.5 0.1 0.6 0 N 12.9 13.0 0.1 0.9 0 N
234 61.8 60.1 -1.7 -2.8 -4 SB 124 119 -5 -4 -3 63.5 62.4 -1.1 -1.7 -3 SB 123 118 -5 -4 -2 19.2 19.2 0.1 0.5 0 N 12.8 12.9 0.1 1.0 0 N
235 59.8 57.0 -2.8 -4.7 -7 SB 118 111 -7 -6 -3 61.5 59.4 -2.1 -3.4 -5 SB 118 111 -7 -6 -4 19.0 18.9 0.0 -0.2 0 N 12.7 12.7 0.0 0.3 0 N
236 55.6 54.6 -1.0 -1.8 -2 SB 103 101 -3 -3 -1 57.8 56.9 -0.9 -1.6 -2 SB 105 102 -4 -3 -2 18.4 18.4 0.0 -0.1 0 N 12.3 12.3 0.0 -0.1 0 N
237 55.7 54.5 -1.1 -2.0 -3 SB 102 100 -2 -2 -1 57.9 56.9 -1.0 -1.7 -3 SB 105 102 -3 -2 -1 18.4 18.4 0.0 -0.1 0 N 12.3 12.3 0.0 -0.1 0 N
238 58.3 56.5 -1.9 -3.2 -5 SB 112 108 -4 -3 -2 61.2 59.5 -1.7 -2.8 -4 SB 116 114 -2 -2 -1 18.6 18.4 -0.1 -0.6 0 N 12.4 12.3 -0.1 -0.6 0 N
239 58.6 56.7 -2.0 -3.4 -5 SB 112 108 -5 -4 -2 61.5 59.7 -1.8 -3.0 -5 SB 115 113 -2 -2 -1 18.6 18.5 -0.1 -0.6 0 N 12.4 12.4 -0.1 -0.5 0 N
240 75.1 70.2 -4.9 -6.5 -12 SB 150 148 -2 -1 -1 80.1 75.1 -5.0 -6.3 -13 SB 159 158 -1 -1 0 19.7 19.4 -0.3 -1.7 -1 N 13.2 13.0 -0.2 -1.6 -1 N
241 75.4 71.1 -4.3 -5.7 -11 SB 150 151 1 0 0 80.3 76.2 -4.2 -5.2 -10 SB 160 161 1 1 1 19.8 19.4 -0.3 -1.8 -1 N 13.2 13.0 -0.2 -1.8 -1 N
242 68.6 66.0 -2.7 -3.9 -7 SB 151 147 -4 -3 -2 72.8 70.5 -2.4 -3.3 -6 SB 162 158 -4 -2 -2 19.3 19.1 -0.2 -1.0 -1 N 12.9 12.8 -0.1 -0.9 0 N
243 70.5 67.8 -2.6 -3.8 -7 SB 158 157 -1 -1 -1 74.9 72.6 -2.3 -3.0 -6 SB 167 168 1 1 1 19.4 19.2 -0.2 -1.2 -1 N 13.0 12.8 -0.1 -1.1 -1 N
244 58.5 56.5 -2.0 -3.4 -5 SB 111 107 -4 -4 -2 61.4 59.3 -2.1 -3.5 -5 SB 117 111 -6 -5 -3 18.5 18.5 -0.1 -0.4 0 N 12.4 12.3 -0.1 -0.5 0 N
245 58.9 56.7 -2.3 -3.9 -6 SB 113 107 -6 -5 -3 61.9 59.4 -2.4 -3.9 -6 SB 117 110 -7 -6 -3 18.6 18.5 -0.1 -0.5 0 N 12.4 12.4 -0.1 -0.5 0 N
246 78.6 71.2 -7.4 -9.4 -19 SB 158 139 -19 -12 -9 83.9 75.3 -8.6 -10.3 -22 SB 166 144 -21 -13 -11 20.3 19.9 -0.4 -2.1 -1 N 13.5 13.2 -0.3 -2.3 -1 N
247 78.5 70.9 -7.6 -9.6 -19 SB 156 138 -18 -12 -9 83.8 75.0 -8.7 -10.4 -22 SB 165 144 -21 -13 -11 20.3 19.9 -0.4 -2.1 -1 N 13.5 13.2 -0.3 -2.3 -1 N
248 56.1 55.4 -0.8 -1.4 -2 SB 103 103 0 0 0 58.6 57.7 -0.8 -1.4 -2 SB 105 104 -1 -1 0 18.5 18.4 -0.1 -0.3 0 N 12.4 12.3 0.0 -0.3 0 N
249 55.9 54.9 -0.9 -1.7 -2 SB 105 103 -2 -2 -1 58.3 57.3 -1.0 -1.7 -2 SB 108 103 -5 -4 -2 18.5 18.4 -0.1 -0.4 0 N 12.4 12.3 -0.1 -0.5 0 N
250 59.2 58.0 -1.2 -2.1 -3 SB 109 109 -1 -1 0 62.2 60.9 -1.3 -2.1 -3 SB 115 112 -3 -2 -1 18.7 18.6 -0.1 -0.6 0 N 12.5 12.4 -0.1 -0.7 0 N
251 58.6 57.2 -1.4 -2.4 -3 SB 112 109 -4 -3 -2 61.4 60.0 -1.5 -2.4 -4 SB 115 114 -2 -1 -1 18.7 18.5 -0.1 -0.7 0 N 12.5 12.4 -0.1 -0.9 0 N
252 74.2 71.7 -2.5 -3.4 -6 SB 147 145 -2 -1 -1 79.0 76.4 -2.7 -3.4 -7 SB 155 155 0 0 0 20.0 19.6 -0.4 -2.0 -1 N 13.5 13.1 -0.3 -2.4 -1 N
253 76.2 72.2 -3.9 -5.2 -10 SB 152 154 2 1 1 80.9 76.4 -4.4 -5.5 -11 SB 160 163 3 2 1 20.3 19.7 -0.6 -2.8 -2 N 13.7 13.1 -0.5 -3.8 -2 N
254 70.2 68.1 -2.2 -3.1 -5 SB 156 149 -7 -5 -4 74.5 72.3 -2.2 -3.0 -6 SB 165 158 -7 -4 -3 19.7 19.4 -0.3 -1.6 -1 N 13.2 13.0 -0.3 -2.0 -1 N
255 71.8 71.5 -0.3 -0.4 -1 MB 143 133 -10 -7 -5 76.0 75.3 -0.6 -0.8 -2 SB 148 138 -11 -7 -5 19.9 20.1 0.1 0.7 0 N 13.2 13.3 0.1 0.5 0 N
256 71.1 71.5 0.4 0.5 1 MA 159 171 12 7 6 75.1 75.4 0.2 0.3 1 MA 169 180 11 7 6 19.9 20.0 0.2 0.9 1 N 13.2 13.3 0.1 0.8 0 N
257 68.2 64.6 -3.6 -5.2 -9 SB 153 140 -13 -8 -6 72.1 67.9 -4.2 -5.8 -11 SB 162 147 -14 -9 -7 19.5 19.4 -0.1 -0.7 0 N 13.0 12.9 -0.1 -0.9 0 N
258 59.8 56.9 -2.9 -4.8 -7 SB 114 106 -8 -7 -4 62.3 59.2 -3.1 -4.9 -8 SB 117 109 -8 -7 -4 19.0 18.8 -0.2 -1.0 -1 N 12.7 12.5 -0.1 -1.1 -1 N
259 59.4 57.2 -2.2 -3.7 -6 SB 119 113 -6 -5 -3 61.9 59.5 -2.4 -3.8 -6 SB 122 113 -9 -7 -4 19.0 18.9 -0.1 -0.8 0 N 12.7 12.6 -0.1 -0.8 0 N
260 59.1 57.0 -2.1 -3.6 -5 SB 118 112 -6 -5 -3 61.5 59.3 -2.3 -3.7 -6 SB 120 113 -8 -7 -4 19.0 18.9 -0.1 -0.8 0 N 12.6 12.5 -0.1 -0.8 0 N
261 59.8 56.8 -3.0 -5.0 -7 SB 114 106 -9 -8 -4 62.2 59.1 -3.2 -5.1 -8 SB 116 108 -9 -8 -4 19.1 18.9 -0.2 -1.2 -1 N 12.7 12.5 -0.1 -1.2 -1 N
262 63.2 61.9 -1.3 -2.0 -3 SB 114 110 -5 -4 -2 65.1 63.7 -1.4 -2.1 -3 SB 115 111 -4 -4 -2 19.5 19.5 -0.1 -0.3 0 N 13.0 13.0 0.0 -0.2 0 N
263 62.4 61.1 -1.3 -2.1 -3 SB 116 111 -5 -4 -3 64.3 63.0 -1.4 -2.2 -3 SB 116 112 -4 -4 -2 19.4 19.4 -0.1 -0.4 0 N 13.0 12.9 0.0 -0.3 0 N
264 60.6 59.4 -1.2 -2.0 -3 SB 125 121 -4 -4 -2 62.5 61.3 -1.2 -2.0 -3 SB 126 121 -4 -3 -2 19.2 19.2 -0.1 -0.4 0 N 12.8 12.8 0.0 -0.3 0 N
265 60.9 59.8 -1.1 -1.7 -3 SB 125 121 -4 -3 -2 62.8 61.7 -1.1 -1.8 -3 SB 126 122 -4 -3 -2 19.3 19.2 0.0 -0.3 0 N 12.8 12.8 0.0 -0.2 0 N
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 54 of 55 March 2016
‘Official’ Annual Mean NO2 Official 99.8th
%iles of 1h NO2 Sensitivity Test Annual Mean NO2 Sensitivity 99.8h %iles 1h NO2 Annual Mean PM10 Annual Mean PM2.5
R DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 D
266 56.0 55.1 -0.9 -1.6 -2 SB 107 104 -3 -2 -1 58.0 57.1 -1.0 -1.7 -2 SB 108 106 -2 -2 -1 18.8 18.7 0.0 -0.2 0 N 12.5 12.5 0.0 -0.2 0 N
267 56.0 55.3 -0.7 -1.2 -2 SB 109 106 -3 -3 -2 58.0 57.3 -0.7 -1.3 -2 SB 109 107 -3 -2 -1 18.8 18.8 0.0 -0.1 0 N 12.5 12.5 0.0 -0.1 0 N
268 62.8 62.0 -0.9 -1.4 -2 SB 122 120 -2 -2 -1 65.6 64.4 -1.2 -1.8 -3 SB 122 121 -1 -1 -1 19.3 19.3 0.0 0.0 0 N 12.8 12.9 0.0 0.1 0 N
269 62.8 61.8 -1.0 -1.6 -2 SB 122 120 -1 -1 -1 65.6 64.3 -1.3 -2.0 -3 SB 123 123 0 0 0 19.3 19.3 0.0 0.0 0 N 12.8 12.8 0.0 0.1 0 N
270 61.9 61.0 -0.9 -1.5 -2 SB 118 116 -2 -2 -1 64.6 63.4 -1.2 -1.8 -3 SB 122 118 -3 -3 -2 19.2 19.2 0.0 0.0 0 N 12.8 12.8 0.0 0.0 0 N
271 62.0 61.1 -0.9 -1.4 -2 SB 119 117 -2 -2 -1 64.8 63.6 -1.2 -1.9 -3 SB 123 120 -3 -2 -1 19.2 19.2 0.0 0.0 0 N 12.8 12.8 0.0 0.1 0 N
272 63.9 64.1 0.3 0.4 1 MA 132 131 -2 -1 -1 67.3 66.8 -0.5 -0.8 -1 MB 140 136 -4 -3 -2 19.2 19.6 0.4 1.9 1 N 12.8 13.1 0.3 2.1 1 N
273 81.1 74.8 -6.3 -7.8 -16 SB 212 181 -31 -15 -16 86.2 78.3 -7.9 -9.2 -20 SB 221 189 -32 -14 -16 20.5 20.5 0.0 -0.1 0 N 13.7 13.6 -0.1 -0.6 0 N
274 85.7 76.5 -9.1 -10.7 -23 SB 242 197 -45 -19 -22 90.7 80.1 -10.6 -11.7 -27 SB 252 204 -49 -19 -24 20.8 20.5 -0.3 -1.5 -1 N 14.0 13.7 -0.3 -2.1 -1 N
275 90.4 79.6 -10.8 -11.9 -27 SB 199 178 -21 -10 -10 95.7 83.3 -12.4 -12.9 -31 SB 202 181 -21 -10 -11 21.5 20.9 -0.7 -3.1 -2 N 14.5 13.9 -0.6 -4.0 -2 N
276 79.9 79.4 -0.5 -0.6 -1 MB 193 197 4 2 2 83.9 83.5 -0.4 -0.4 -1 MB 199 204 4 2 2 20.8 20.8 0.0 0.2 0 N 14.0 14.0 0.1 0.4 0 N
277 81.9 81.6 -0.3 -0.4 -1 MB 159 162 3 2 2 86.4 85.7 -0.7 -0.8 -2 SB 169 173 4 2 2 21.0 21.1 0.2 0.7 0 N 14.1 14.2 0.1 0.8 0 N
278 83.5 82.3 -1.2 -1.4 -3 SB 174 183 9 5 4 87.6 86.5 -1.1 -1.2 -3 SB 177 187 10 5 5 21.4 21.2 -0.2 -0.7 0 N 14.4 14.3 -0.2 -1.1 -1 N
279 54.5 53.7 -0.8 -1.5 -2 SB 101 100 -1 -1 -1 57.0 56.0 -0.9 -1.6 -2 SB 104 103 -1 -1 -1 18.3 18.3 -0.1 -0.3 0 N 12.3 12.2 0.0 -0.3 0 N
280 54.4 53.7 -0.7 -1.2 -2 SB 100 99 -1 -1 -1 56.6 55.8 -0.8 -1.4 -2 SB 103 100 -3 -3 -1 18.4 18.3 0.0 -0.2 0 N 12.3 12.3 0.0 -0.2 0 N
281 62.6 62.4 -0.2 -0.3 -1 MB 112 112 0 0 0 64.7 64.2 -0.5 -0.8 -1 MB 113 112 -2 -1 -1 19.2 19.3 0.0 0.1 0 N 12.9 12.9 0.0 0.2 0 N
282 66.4 66.5 0.1 0.1 0 N 120 120 0 0 0 69.1 68.9 -0.2 -0.3 -1 MB 125 125 0 0 0 19.6 19.6 0.0 0.2 0 N 13.2 13.2 0.0 0.1 0 N
283 68.1 67.1 -1.0 -1.4 -2 SB 142 142 0 0 0 70.6 69.5 -1.1 -1.6 -3 SB 144 144 0 0 0 19.9 19.8 -0.1 -0.5 0 N 13.4 13.3 -0.1 -0.6 0 N
284 62.6 62.4 -0.1 -0.2 0 N 110 110 0 0 0 64.6 64.1 -0.5 -0.7 -1 MB 113 112 -1 -1 -1 19.3 19.3 0.0 0.1 0 N 12.9 12.9 0.0 0.1 0 N
285 67.3 65.6 -1.6 -2.4 -4 SB 135 133 -2 -2 -1 69.2 67.2 -2.0 -2.9 -5 SB 133 130 -3 -2 -1 19.9 19.8 -0.1 -0.6 0 N 13.3 13.3 -0.1 -0.5 0 N
286 68.8 67.4 -1.5 -2.1 -4 SB 137 136 -1 0 0 70.5 68.8 -1.8 -2.5 -4 SB 137 134 -2 -2 -1 20.3 20.1 -0.2 -0.8 -1 N 13.6 13.5 -0.1 -0.9 0 N
287 62.1 60.5 -1.6 -2.6 -4 SB 110 105 -5 -4 -2 63.7 61.9 -1.8 -2.8 -4 SB 111 105 -5 -5 -3 19.4 19.2 -0.2 -1.1 -1 N 13.0 12.8 -0.2 -1.2 -1 N
288 62.5 60.5 -2.0 -3.1 -5 SB 111 105 -5 -5 -3 64.0 61.9 -2.1 -3.3 -5 SB 111 105 -6 -5 -3 19.5 19.2 -0.3 -1.4 -1 N 13.0 12.8 -0.2 -1.5 -1 N
289 64.9 62.9 -2.0 -3.1 -5 SB 135 129 -6 -4 -3 66.2 64.0 -2.2 -3.3 -5 SB 135 129 -6 -4 -3 19.9 19.5 -0.4 -1.8 -1 N 13.4 13.1 -0.3 -2.1 -1 N
290 63.4 61.6 -1.7 -2.7 -4 SB 130 126 -4 -3 -2 64.8 63.0 -1.8 -2.8 -5 SB 130 125 -5 -4 -2 19.7 19.4 -0.3 -1.5 -1 N 13.2 13.0 -0.2 -1.7 -1 N
291 64.6 59.0 -5.6 -8.6 -14 SB 121 110 -10 -9 -5 67.0 61.1 -5.9 -8.9 -15 SB 121 110 -11 -9 -5 19.5 19.0 -0.5 -2.6 -2 N 13.1 12.7 -0.3 -2.6 -1 N
292 64.2 59.5 -4.7 -7.4 -12 SB 135 116 -19 -14 -10 66.4 61.5 -5.0 -7.5 -12 SB 135 114 -21 -15 -10 19.5 19.1 -0.4 -2.1 -1 N 13.1 12.8 -0.3 -2.1 -1 N
293 60.4 58.8 -1.6 -2.6 -4 SB 116 112 -5 -4 -2 62.6 60.9 -1.8 -2.8 -4 SB 118 113 -5 -5 -3 19.0 19.0 0.0 0.2 0 N 12.7 12.8 0.1 0.5 0 N
294 74.0 70.3 -3.8 -5.1 -9 SB 143 134 -9 -6 -4 80.1 75.4 -4.7 -5.8 -12 SB 154 143 -11 -7 -6 19.7 19.4 -0.2 -1.3 -1 N 13.2 13.1 -0.2 -1.4 -1 N
295 75.1 71.5 -3.7 -4.9 -9 SB 144 139 -5 -3 -2 80.8 76.2 -4.6 -5.7 -12 SB 155 146 -9 -6 -5 19.9 19.7 -0.2 -0.9 -1 N 13.4 13.3 -0.1 -0.8 0 N
296 72.3 68.5 -3.8 -5.3 -10 SB 179 164 -16 -9 -8 78.0 73.3 -4.7 -6.0 -12 SB 195 178 -18 -9 -9 19.6 19.3 -0.3 -1.4 -1 N 13.2 13.0 -0.2 -1.6 -1 N
297 72.7 68.9 -3.8 -5.2 -9 SB 180 167 -13 -7 -6 78.2 73.5 -4.7 -5.9 -12 SB 196 180 -16 -8 -8 19.6 19.4 -0.2 -1.3 -1 N 13.2 13.0 -0.2 -1.3 -1 N
298 73.2 69.0 -4.2 -5.7 -10 SB 188 171 -17 -9 -9 80.0 74.9 -5.1 -6.3 -13 SB 209 191 -18 -9 -9 19.5 19.0 -0.5 -2.3 -1 N 13.1 12.8 -0.4 -2.7 -1 N
299 75.0 70.8 -4.1 -5.5 -10 SB 146 135 -11 -8 -6 82.3 77.3 -5.0 -6.1 -13 SB 163 149 -14 -9 -7 19.6 19.1 -0.4 -2.2 -1 N 13.2 12.8 -0.3 -2.6 -1 N
300 87.2 83.7 -3.5 -4.0 -9 SB 177 172 -5 -3 -3 94.7 90.7 -4.0 -4.2 -10 SB 194 185 -9 -5 -5 21.1 20.4 -0.6 -3.0 -2 N 14.2 13.7 -0.5 -3.6 -2 N
301 79.5 82.2 2.6 3.3 7 SA 205 222 17 9 9 85.1 88.4 3.4 4.0 8 SA 222 243 20 9 10 20.4 20.4 -0.1 -0.4 0 N 13.7 13.6 -0.1 -0.7 0 N
302 80.5 77.8 -2.7 -3.4 -7 SB 190 175 -16 -8 -8 87.4 84.6 -2.8 -3.2 -7 SB 206 192 -14 -7 -7 20.4 19.9 -0.6 -2.7 -2 N 13.8 13.3 -0.4 -3.2 -2 N
303 85.6 91.4 5.8 6.7 14 SA 233 262 29 12 14 93.1 100.5 7.4 7.9 19 SA 256 287 31 12 15 20.8 20.7 -0.1 -0.3 0 N 14.0 13.9 -0.1 -0.8 0 N
304 76.0 74.4 -1.6 -2.2 -4 SB 184 173 -10 -6 -5 80.5 79.4 -1.1 -1.4 -3 SB 192 184 -8 -4 -4 20.3 20.0 -0.3 -1.6 -1 N 13.7 13.4 -0.3 -1.8 -1 N
305 75.9 74.3 -1.7 -2.2 -4 SB 182 172 -10 -6 -5 80.5 79.4 -1.1 -1.4 -3 SB 190 183 -8 -4 -4 20.3 20.0 -0.3 -1.6 -1 N 13.7 13.4 -0.3 -1.9 -1 N
306 80.2 78.0 -2.3 -2.9 -6 SB 163 161 -3 -2 -1 84.7 82.7 -1.9 -2.3 -5 SB 169 168 -1 -1 -1 20.9 20.5 -0.4 -1.8 -1 N 14.1 13.8 -0.3 -2.4 -1 N
307 80.0 77.2 -2.7 -3.4 -7 SB 167 162 -5 -3 -3 84.8 82.4 -2.4 -2.8 -6 SB 175 169 -5 -3 -3 20.8 20.4 -0.4 -2.0 -1 N 14.1 13.7 -0.4 -2.6 -1 N
308 60.8 58.3 -2.5 -4.1 -6 SB 113 109 -4 -3 -2 63.4 60.6 -2.8 -4.3 -7 SB 116 112 -4 -4 -2 18.9 18.7 -0.2 -1.0 -1 N 12.7 12.6 -0.1 -1.0 0 N
309 59.7 57.1 -2.6 -4.3 -6 SB 116 110 -6 -5 -3 62.4 59.6 -2.8 -4.5 -7 SB 119 110 -9 -8 -5 18.8 18.6 -0.2 -1.0 -1 N 12.6 12.5 -0.1 -1.0 -1 N
310 62.5 62.3 -0.2 -0.3 0 N 118 117 -1 -1 -1 65.9 65.7 -0.2 -0.3 -1 MB 122 122 -1 0 0 18.9 18.9 0.0 0.2 0 N 12.6 12.7 0.0 0.1 0 N
311 62.1 62.0 -0.2 -0.3 0 N 121 118 -3 -2 -1 65.6 65.5 -0.2 -0.2 0 N 124 123 -2 -1 -1 18.9 18.9 0.0 0.1 0 N 12.6 12.6 0.0 0.0 0 N
312 62.4 62.2 -0.2 -0.4 -1 MB 119 117 -2 -2 -1 66.0 65.7 -0.3 -0.4 -1 MB 123 121 -2 -2 -1 18.9 18.9 0.0 0.2 0 N 12.6 12.6 0.0 0.1 0 N
313 61.6 60.9 -0.7 -1.1 -2 SB 116 113 -3 -3 -1 65.5 64.8 -0.7 -1.0 -2 SB 120 117 -3 -3 -2 18.7 18.7 -0.1 -0.3 0 N 12.6 12.5 0.0 -0.3 0 N
314 62.5 62.0 -0.5 -0.8 -1 MB 116 112 -3 -3 -2 66.6 66.2 -0.4 -0.6 -1 MB 124 119 -5 -4 -2 18.8 18.7 -0.1 -0.3 0 N 12.6 12.5 0.0 -0.4 0 N
315 84.1 79.7 -4.4 -5.2 -11 SB 172 164 -8 -5 -4 89.7 84.8 -5.0 -5.5 -12 SB 180 170 -10 -6 -5 20.6 20.4 -0.2 -0.8 -1 N 13.7 13.6 -0.1 -0.8 0 N
316 78.1 75.9 -2.1 -2.8 -5 SB 153 148 -5 -3 -3 83.4 81.1 -2.3 -2.7 -6 SB 162 158 -4 -2 -2 20.0 20.0 0.0 0.0 0 N 13.4 13.4 0.0 0.1 0 N
317 89.4 81.9 -7.5 -8.4 -19 SB 192 174 -18 -9 -9 95.9 86.9 -9.0 -9.3 -22 SB 202 181 -21 -11 -11 21.2 20.8 -0.3 -1.4 -1 N 14.1 13.9 -0.2 -1.4 -1 N
318 83.0 78.1 -4.9 -5.9 -12 SB 169 154 -15 -9 -7 88.7 82.8 -5.9 -6.7 -15 SB 178 163 -15 -8 -7 20.6 20.5 -0.1 -0.3 0 N 13.7 13.7 0.0 -0.2 0 N
319 81.2 76.8 -4.4 -5.4 -11 SB 211 190 -21 -10 -11 86.9 81.5 -5.3 -6.1 -13 SB 225 203 -22 -10 -11 20.4 20.4 0.0 0.1 0 N 13.6 13.6 0.0 0.3 0 N
320 79.7 76.5 -3.2 -4.0 -8 SB 207 188 -19 -9 -9 85.0 81.2 -3.8 -4.5 -10 SB 218 196 -22 -10 -11 20.2 20.2 0.0 0.0 0 N 13.5 13.5 0.0 0.1 0 N
321 63.4 62.8 -0.7 -1.1 -2 SB 116 116 0 0 0 66.8 65.8 -1.0 -1.6 -3 SB 123 121 -2 -2 -1 19.2 19.3 0.1 0.5 0 N 12.8 12.8 0.1 0.5 0 N
322 63.3 63.3 0.0 0.0 0 N 118 118 1 1 0 66.9 66.6 -0.3 -0.4 -1 MB 124 124 0 0 0 19.2 19.3 0.1 0.7 0 N 12.7 12.8 0.1 0.7 0 N
323 62.1 61.4 -0.8 -1.2 -2 SB 114 112 -1 -1 -1 65.3 64.2 -1.1 -1.6 -3 SB 120 117 -3 -3 -2 19.1 19.2 0.0 0.3 0 N 12.7 12.8 0.0 0.3 0 N
324 63.3 63.2 0.0 -0.1 0 N 119 117 -2 -2 -1 66.7 66.3 -0.3 -0.5 -1 MB 124 124 0 0 0 19.2 19.4 0.1 0.7 0 N 12.8 12.9 0.1 0.8 0 N
325 63.1 62.4 -0.8 -1.2 -2 SB 122 119 -3 -2 -1 66.8 65.7 -1.1 -1.7 -3 SB 129 126 -3 -2 -1 19.1 19.2 0.1 0.5 0 N 12.7 12.8 0.1 0.5 0 N
326 63.7 63.5 -0.2 -0.3 -1 MB 132 130 -2 -2 -1 67.1 66.2 -0.9 -1.3 -2 SB 137 133 -4 -3 -2 19.2 19.5 0.3 1.3 1 N 12.8 13.0 0.2 1.5 1 N
Baker Street and Gloucester Place 2-way System Air Quality Assessment
J2451 55 of 55 March 2016
‘Official’ Annual Mean NO2 Official 99.8th
%iles of 1h NO2 Sensitivity Test Annual Mean NO2 Sensitivity 99.8h %iles 1h NO2 Annual Mean PM10 Annual Mean PM2.5
R DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 DM DS Ch1 Ch2 Ch3 D DM DS Ch1 Ch2 Ch3 D
327 63.9 63.7 -0.1 -0.2 0 N 126 126 0 0 0 67.7 67.3 -0.4 -0.6 -1 MB 131 130 -1 0 0 19.2 19.3 0.2 0.8 0 N 12.7 12.8 0.1 0.8 0 N
328 88.2 85.4 -2.8 -3.2 -7 SB 186 177 -9 -5 -4 97.5 93.8 -3.7 -3.8 -9 SB 208 197 -11 -5 -5 20.6 20.6 0.0 0.0 0 N 13.7 13.7 0.1 0.5 0 N
329 88.0 84.2 -3.8 -4.3 -9 SB 186 178 -8 -4 -4 97.6 92.7 -4.9 -5.0 -12 SB 208 199 -9 -4 -5 20.5 20.5 0.0 -0.2 0 N 13.6 13.7 0.0 0.3 0 N
330 91.1 90.7 -0.4 -0.5 -1 MB 215 227 12 6 6 99.3 98.6 -0.6 -0.6 -2 SB 233 242 9 4 5 20.5 20.6 0.1 0.7 0 N 13.6 13.8 0.2 1.2 1 N
331 91.5 90.7 -0.8 -0.9 -2 SB 221 221 0 0 0 100.1 99.2 -0.9 -0.9 -2 SB 242 239 -3 -1 -1 20.9 21.0 0.1 0.5 0 N 14.0 14.1 0.1 0.8 0 N
332 88.2 89.6 1.4 1.6 4 SA 179 183 3 2 2 96.1 98.0 1.9 2.0 5 SA 198 201 2 1 1 20.9 21.0 0.1 0.5 0 N 14.0 14.1 0.1 0.5 0 N
333 92.8 94.5 1.8 1.9 4 SA 243 264 20 8 10 100.5 103.7 3.2 3.2 8 SA 265 285 20 7 10 21.6 21.3 -0.3 -1.3 -1 N 14.4 14.2 -0.2 -1.2 -1 N
334 86.2 89.7 3.5 4.1 9 SA 235 256 21 9 11 93.4 98.1 4.6 5.0 12 SA 255 278 24 9 12 20.8 20.9 0.1 0.6 0 N 13.9 14.0 0.1 0.8 0 N