PM 2.5 Stakeholder PM 2.5 Stakeholder Working GroupWorking Group

Meeting #1 Meeting #1

South Coast Air Quality Management DistrictSouth Coast Air Quality Management District

June 8, 2006June 8, 2006

Working GroupWorking Group

• Purpose – provide input on:Purpose – provide input on: PM2.5 significance thresholdsPM2.5 significance thresholds PM2.5 calculation methodologyPM2.5 calculation methodology

• Significance thresholds are necessary in Significance thresholds are necessary in analyzing local and regional PM 2.5 air analyzing local and regional PM 2.5 air quality impacts in CEQA and NEPA air quality impacts in CEQA and NEPA air quality analysisquality analysis

Working Group MembersWorking Group Members

• Environmental OrganizationsEnvironmental Organizations• Public AgenciesPublic Agencies• Regulated OrganizationsRegulated Organizations

PM 2.5PM 2.5• Particulate Matter less than or equal to 2.5 Particulate Matter less than or equal to 2.5

micronsmicrons• Mostly derived from combustion sourcesMostly derived from combustion sources

Mobile sources - auto, trucksMobile sources - auto, trucks Stationary sources – ICEsStationary sources – ICEs

• Directly emitted or formed in atmosphere Directly emitted or formed in atmosphere from combustion of gases (such as NOx from combustion of gases (such as NOx and SOx combining with ammonia)and SOx combining with ammonia)

PM 2.5 StandardsPM 2.5 Standards• Federal PM 2.5 standards established in 1997Federal PM 2.5 standards established in 1997

• State PM 2.5 standards established in 2002State PM 2.5 standards established in 2002

Annual Annual 15 15 µµg/mg/m33

24-hour24-hour 65 65 µµg/mg/m33

Annual Annual 12 12 µµg/mg/m33

24-hour24-hour n/an/a

PM2.5 Air QualityPM2.5 Air Quality

Trends of Basin PM2.5 (Trends of Basin PM2.5 (µµg/mg/m33))

05

101520253035

1999 2000 2001 2002 2003 2004 2005

An

nu

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vera

ge

0

50

100

150

24-H

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Annual Average Maximum 24-Hr Average

PM2.5 and the 2007 AQMPPM2.5 and the 2007 AQMP

• Three-year planning document will Three-year planning document will outline control strategy to achieve outline control strategy to achieve standardsstandards

• Federal annual PM2.5 standard (15 Federal annual PM2.5 standard (15 µµg/mg/m33) to be met by 2015 (including ) to be met by 2015 (including five-year extension)five-year extension)

• VOC and SOx reductions needed to VOC and SOx reductions needed to achieve PM2.5 standardsachieve PM2.5 standards

• On-going modeling, development of On-going modeling, development of inventory and control measures, etc.inventory and control measures, etc.

PM2.5 Calculation Methodology PM2.5 Calculation Methodology

• PM emissions typically contain specific PM emissions typically contain specific fractions of PM10 and PM2.5fractions of PM10 and PM2.5

• California Emission Inventory Data and California Emission Inventory Data and Reporting System (CEIDARS) lists Reporting System (CEIDARS) lists wide variety of industrial processes and wide variety of industrial processes and PM size speciationPM size speciation

• PM2.5 fraction of PM10 establishedPM2.5 fraction of PM10 established• Apply PM2.5Apply PM2.5 fraction of PM10 for fraction of PM10 for

appropriate process appropriate process

Localized Significance ThresholdsLocalized Significance Thresholds

• Effects of PM2.5 on nearby receptors, Effects of PM2.5 on nearby receptors, such as residents, hospitals. schools, etc.such as residents, hospitals. schools, etc.

• OperationalOperational PM2.5 generated from combustion sourcesPM2.5 generated from combustion sources

• ConstructionConstruction Fugitive dustFugitive dust Off-Road construction equipmentOff-Road construction equipment

LST - OperationalLST - Operational

• PM10 significance threshold 2.5 PM10 significance threshold 2.5 µµg/mg/m33 (Rule 1303, Table A-2)(Rule 1303, Table A-2)

• 2003 AQMP PM Inventory (2005-2010) 2003 AQMP PM Inventory (2005-2010) demonstrated PM2.5 is 99 percent of demonstrated PM2.5 is 99 percent of PM10 in stationary source fuel combustionPM10 in stationary source fuel combustion

• Recommended operational PM2.5 LST Recommended operational PM2.5 LST same as PM10 (2.5 same as PM10 (2.5 µµg/mg/m33))

LST - ConstructionLST - Construction

• Fugitive DustFugitive Dust 2003 AQMP PM Inventory (2005-2010) 2003 AQMP PM Inventory (2005-2010)

demonstrated PM2.5 is 21 percent of fugitive demonstrated PM2.5 is 21 percent of fugitive dust PM10dust PM10

PM10 construction LST 10.4 PM10 construction LST 10.4 µµg/mg/m33 PM2.5 fugitive dust LST 2.2 PM2.5 fugitive dust LST 2.2 µµg/mg/m33 (21 percent (21 percent

of 10.4 of 10.4 µµg/mg/m33))

LST – ConstructionLST – Construction

• Off-Road Construction EquipmentOff-Road Construction Equipment 2003 AQMP PM Inventory (2005-2010) 2003 AQMP PM Inventory (2005-2010)

demonstrated PM2.5 is 89 percent of demonstrated PM2.5 is 89 percent of combustion PM10 from Off-Road Equipmentcombustion PM10 from Off-Road Equipment

Unquantifiable contribution from combustion Unquantifiable contribution from combustion PM from off-road sourcesPM from off-road sources

• Recommended construction PM2.5 LST at Recommended construction PM2.5 LST at 2.5 2.5 µµg/mg/m33 (same as operational LST). (same as operational LST).

Regional Significance ThresholdRegional Significance Threshold

• PM2.5 suspended for longer periods PM2.5 suspended for longer periods resulting in regional effectsresulting in regional effects

• EPA proposed significant emission rate of EPA proposed significant emission rate of 10 tons per year for PM2.5 (Federal 10 tons per year for PM2.5 (Federal Register, Sept 8, 2005)Register, Sept 8, 2005)

• 10 tons per year = 55 pounds per day10 tons per year = 55 pounds per day• Recommending construction and Recommending construction and

operational regional PM2.5 significance operational regional PM2.5 significance threshold same as EPA (55 pounds/day)threshold same as EPA (55 pounds/day)

ScheduleSchedule• Working Group review until June 23Working Group review until June 23• 22ndnd Working Group Meeting early July Working Group Meeting early July• Public Workshop late JulyPublic Workshop late July• Recommendations to Governing Board Recommendations to Governing Board

Meeting on September 8, 2006Meeting on September 8, 2006• Effective Dates:Effective Dates:

Begin public outreach after Board approvalBegin public outreach after Board approval Request implementation by public agencies Request implementation by public agencies

early 2007early 2007