Creating air pollution map and analyzing traffic survey
HCMUS-OPU SUMMER EXCHANGE PROGRAM 2016
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Osaka Prefecture University
Yutaro Goto
Shogo Nagano
Narumi Tahara
Mami Harada
Professor Norimichi Takenaka
Table of Contents
Backgrounds: Economic growth in Vietnam
※出展:ベトナム経済の現状と今後の展望高成長よりも不均衡・非効率の解消が必要なベトナム経済 (三菱UFJリサーチ&コンサルティング)
Economy of Vietnam is significantly developing.
Comparing from the other countries in ASEAN
which has economic turndown after Lehman shock,
Vietnam maintained a high economic growth.
Changes in sales of vehicle in Vietnam
The sales of vehicle which
shows the wealth of the
economic conditions is
Increasing.
Background: Air pollution
Reasons of air pollution
①Rapid economic growth②Growth of populations③Major development of industries
Emission from motor bikes, cars, etc.(CO, CO2, NOx, HC)
is especially problems in urban area.
Previous work
Background: Health damage
NO2
pharyngitis(throat), bronchitis(bronchus)
pneumonia(lungs)
SOxbronchitis, asthma
HONOasthmatic response, convulsion
http://ailovei.com/?p=15743
http://news.livedoor.com/article/detail/7544236/
http://www.binchoutan.com/event/2013/taiki.html
PM10, SPM, PM2.5respiratory illness, cancer, pollinosis
Objectives
2 years ago
①Air pollution analysis in Ho chi minh city
→Making air pollution map+
②Compare with data taken2 years ago
+
③Counting traffic surveyThis project
Materials & Methods
Materials & Methods
Passive Sampler
56 point
NO2 colorimetry
NH3ion chromatography
Active Sampler
4 point
PM2.5 gravimetry
HNO3 ion chromatography
NH3 ion chromatography
HONO ion chromatography
Traffic Census (2 points)
To identify the factor of air pollution more clearly
Passive samplers( 58 points )
Active samplers( 4 points )
Traffic count
( 2 points )
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Materials & Methods: Points of Measurement
HCMUS
Merit:Can analyze accurately Demerit:Need electric source
air
air
Materials & Methods: Active Samplers
Teflon filter to catch PM2.5
Doughnut filter(for particulate matter more than 2.5 microns in diameter)
NH3
HNO3
NO2
HONO, NO2
PM2.5
Schedule
26, (Fri) Setting samplers
27, (Sat)
28, (Sun)Changing filters
(1st)
29, (Mon)
30, (Tue)Changing filters
(2nd)
31, (Wed)
1, (Thr) collecting
Pump
Mass flow controller
Materials & Methods: Active Samplers
Set active samplers to 4 places
Merit: Don’t need electric sourceDemerit: Cannot analyse accurately
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Materials & Methods: Passive Samplers
Measuring NO2 & O3 concentration
Schedule
26,(Fri)
SettingSamplers
27,(Sat)
28,(Sun)
29,(Mon)
30,(Thu)
31,(Wed)
Collecting
1,(Thr)
Analyze
5days
exposed
Analysis the absorbency of 545 nm
spectrophotometer
Method of calculating NO2
concentration①Making calibration curve
②Measuring absorbance of solution
with unknown concentration③ Calculating NO2 by using calibration curve
Materials & Methods: Analysis of NO2
Calibration curve
Samples of PS
Materials & Methods: Traffic census
com具14
Picture of traffic survey
Standard-size vehicle, Heavy duty and Motorbike Category
Busy street(NVC) and quiet street(Chi’s house)Where
When A weekday and a holiday
For 5min. par 1h in the daytime / par 2h at night
Counting number of traffics
Results & Discussions
Results & Discussions: NO2
Big Highway
2 km
✔ Near Big highway,NO2 Concentration was higherthan at places of central city
✔ There are many crowded street
✔ Average 8.8 ppb
Chi’s house
NVC
2年前のデータとの比較
Range were
different !!
Because of…?
Distribution of NO2 didn’t change since 2014But Amount of NO2 was much less than 2014.
Results & Discussions: NO2
A lot of rain!!
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Results & Discussions: NH3
• NH3とNO2で濃度の高いポイントは一致している• 住居区域のNH3基準は 1 ppm=1000 ppb
→ 悪臭物質としてNH3の影響はない
NH3 ppb
0 to 2
2 to 4
4 to 6
6 to 8
8~
< NH3 > < NO2 >
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PM2.5
Results & DiscussionsPM2.5 HNO3 HONO
0
10
20
30
40
50
point 1 point 2 point 3 point 4
μg
/m3
PM2.5
0
0.2
0.4
0.6
point 1 point 2 point 3 point 4
pp
bv
HNO3
0
2
4
point 1 point 2 point 3 point 4
pp
bv
HONO
日本の平均 1 ppbv
2年前 2~8 ppbv
日本の平均 0.5 ppbv
日本の環境基準 35 μg/m3 (1年平均)15 μg/m3 (1日平均)
Place of active samplers on NO2Map
2年前 0~4 ppbv
2年前 20~100 μg/m3
NVCChi’s house
Sta
nd
ard
Heavy d
uty
Results & Discussions: Counting traffic
Mo
torb
ike
Avera
ge
nu
mb
er
of
veh
icle
(/5
min
)
The number of Motorbike wasvery High!!!
Results & Discussions: Counting traffic
NVCTh
e n
um
ber
of
mo
torb
ike (
/5m
in)
Rainstorm
Rainstorm
Rush
✔ In the morning and evening of weekdays, motorbikes were more than weekend because of commuter rush.
Results & Discussions: Counting traffic and NO2 concentration
Rainstorm
✔ Time change of traffic and NO2 concentration had similar trend.✔ After rainstorm, NO2 concentration decreased.
Rainstorm
Est
imate
dn
um
ber
of
veh
icle
(/
ho
ur)
8/28 8/29 8/30
1. We measured and analyzed the air pollutant(NO2, NH3, HONO,PM2.5, HNO3) in Ho Chi Minh city.
2. Amount of all air pollutant was less than the last survey.→ It rained a lot for this survey period than in previous work
3. Trend of NO2 Concentration time change was related to thenumber of vehicles.
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Conclusion
Future works
We have to collect more traffic data at many places
to identify the factor of air pollution more clearly.
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Thank you for your listening
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Remark
• Acceptable human error