Creating air pollution map and analyzing traffic survey ...€¦ · Emission from motor bikes,...
Transcript of Creating air pollution map and analyzing traffic survey ...€¦ · Emission from motor bikes,...
Creating air pollution map and analyzing traffic survey with VNU-HCM students
Osaka Prefecture University
Tomofumi Kiyose
Yusuke Suda
Takako Yamazaki
Air pollution
Economy of Vietnam is significantly developing
Reason of air pollution:◆Rapid economic growth◆Growth of populations◆Major development of industries
Especially problems in urban area
Emission from motor bikes, cars, etc.Air pollutions(CO2, NOx etc.)
Air pollutants increase in Vietnam
2Background
Purpose
Air monitoring by setting equipment in Ho Chi Minh city.→make pollution map
Compare with the result of same experiment last several year.
→discuss about the change of the pollution in Ho Chi Minh city
Sampling with Vietnamese students→attend in international joint study
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Materials & Methods
to identify the factor of air pollution clearly
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49 sampling points
to measure NO2 ,NH3 ,O3
1. Passive Sampler
2. Filter pack
4 sampling points
to measure PM2.5, HNO3, HONO, NO2 and NH3
3. Traffic Count
Materials & Methods
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VNUHCM
Passive samples
+ Filter Pack
City area
What is passive sampler?
Sampler : low Atmosphere : high
Trapping filter
Diffusion of gaseous particles resulted from difference of the gaseous concentration
Principle of passive sampler
○Advantage*Not use power source*Small and light*Low cost*Easy to set and collect
×Disadvantage*Variation is over 10 %
Passive sampler
Airheight : 19 mmdiameter : 30 mmφ
pore size:1.0 mm
remove particles and water drop
Teflon filter
Filter include chemical
To catchNH3 → H3PO4
O3 → NaNO2
NO2 → N(CH2CH2OH)3
Filter pack
○Advantage
*Small and light
*Can collect samples where is no analyzers
×Disadvantage
Need power source
Analysis
Filter pack
pump
F7: TEA 20 %(NO2)F8: TEA 20 %(NO2)
0.1 L/min
3.9 L/min
Calculation
HONO concn. : F4-F5
NO2 concn. : F5×2+F7+F8
MFC
4.0 L/minAir MFC
F1: Donut filter(particle >2.5 µm)F2: Quartz filter(PM2.5)F3:NaCl(HNO3 all)F4: Na2CO3(HONO all、NO2 about 2 %)F5: Na2CO3(Compensate for NO2 of F4)F6: H3PO4 (NH3 all)
Analytical method
Passive sampler(49 places)
Material Analytical method
NH3 IC
NO2 UV-vis
O3 UV-vis
Filter pack sampler(4 places)
Material Analytical method
PM2.5 Weight measurement
HONO IC
HNO3 IC
NH3 IC
NO2 UV-vis
Program schedule
Passive sampler
Filter pack Activity
21/8 Group meeting Welcome party
22 set set Plastic factory
23 Mekong Delta
24 Change filterDalat travel
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26 Change filterCity tour & Cultureexchange program
27 Water park
28 Collect sample Collect samples Karaoke & city tour
29 Analyzing Super market
30 Presentation Ben Tanh market
Keep
Pollution Map:NH3 (2018)
Big Highway
2 km
Tan Binh Dist
Dist. 9
Dist. 2
Dist. 4
Dist. 1
Dist. 3
Dist. 10
Dist. 11
Dist. 6
Dist. 8Dist. 7
Dist. 5
Dist. 12
Thu Duc Dist.
Binh ChanhDist.
Hoc Mon Dist.
Binh ThanhDist.
Phu NhuanDist.
Go Vap Dist.
NH3 ppb75 ~
50 to 75
25 to 50
0 to 25
Saigon River
Big Highway
City area
2018
Emission source:Waste water
NH3 Comparison 2017-18
NH3 ppb75 ~
50 to 75
25 to 50
0 to 25
2017 2018
Saigon River
Location trend is almost same
Big Highway Big Highway
Saigon River
NO2 Comparison 2017-18
NO2 ppb75 ~
50 to 75
25 to 50
0 to 25
2017 2018
Compare 2018 with 2017• NO2 concentration is higher than that of 2017.
• It had not rained much in the measurement period.2NO2 + H2O → HONO + HNO3
NO2 ppb30 ~
20 to 30
10 to 20
0 to 10
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O3 Comparison 2016-18
2018
Different trend
[Counting period] 7 a.m. ~ 6 p.m., for 5min / 1h
[Place]• Front of VNUHCM (NVC street)• Both street (South & North side)
Standard Heavy duty Motorbike
[Type]
Traffic count
VNUHCM
0
2000
4000
6000
8000
10000
12000Bike / Monday to South
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2000
4000
6000
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10000
12000
27/8/2018
28/8/2017
29/8/2016
Bike / Monday to North
Nu
mb
er
of
vie
cle
s/ h
ou
rResult:Traffic count
◆In the morning:North > South
→to go center of city
◆In the evening:South > North
→to go home
Direction to center of city
VNUHCM
Office area
Bed town
Bed town
Bed town
Bed town
Conclusion
NH3: Concentration, location trend is
same to 2017.
NO2: Concentration is higher than 2017.
Location trend is similar.
O3: Concentration is lower than 2016,2017.
Location trend is opposite from last two years.
But this year,
NH3,NO2,O3 are high value in city area.
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