Creating air pollution map and analyzing traffic survey

Transcription

1 1 HCMUS-OPU SUMMER EXCHANGE PROGRAM 2016 Creating air pollution map and analyzing traffic survey Osaka Prefecture University Yutaro Goto Shogo Nagano Narumi Tahara Mami Harada Professor Norimichi Takenaka

2 Table of Contents

3 Backgrounds: Economic growth in Vietnam 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. The sales of vehicle which shows the wealth of the economic conditions is Increasing. Changes in sales of vehicle 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 )

4 Background: Air pollution Reasons of air pollution 1Rapid economic growth 2Growth of populations 3Major development of industries Emission from motor bikes, cars, etc. (CO, CO2, NOx, HC) Previous work is especially problems in urban area.

5 Background: Health damage NO2 pharyngitis(throat), bronchitis(bronchus) pneumonia(lungs) HONO asthmatic response, convulsion SOx bronchitis, asthma PM10, SPM, PM2.5 respiratory illness, cancer, pollinosis

6 Objectives 2 years ago 1Air pollution analysis in Ho chi minh city Making air pollution map + 2Compare with data taken 2 years ago + 3Counting traffic survey This project

7 Materials & Methods

8 Materials & Methods PM2.5 HNO3 NH3 HONO Active Sampler 4 point gravimetry ion chromatography ion chromatography ion chromatography NO2 NH 3 Passive Sampler 56 point colorimetry ion chromatography Traffic Census (2 points) To identify the factor of air pollution more clearly

9 Materials & Methods: Points of Measurement 9 HCMUS Passive samplers ( 58 points ) Active samplers ( 4 points ) Traffic count ( 2 points )

10 Materials & Methods: Active Samplers air Doughnut filter (for particulate matter more than 2.5 microns in diameter) PM2.5 HNO3 Teflon filter to catch PM2.5 HONO, NO2 NO2 NH3 air Merit:Can analyze accurately Demerit:Need electric source

11 Materials & Methods: Active Samplers Set active samplers to 4 places Schedule 26, (Fri) Setting samplers 27, (Sat) 28, (Sun) Changing filters (1st) 29, (Mon) Mass flow controller Pump 30, (Tue) 31, (Wed) Changing filters (2nd) 1, (Thr) collecting

12 Materials & Methods: Passive Samplers 12 Measuring NO2 & O3 concentration Merit: Don t need electric source Demerit: Cannot analyse accurately 26, (Fri) 27, (Sat) 28, (Sun) 29, (Mon) 30, (Thu) 31, (Wed) 1, (Thr) Schedule Setting Samplers 5days exposed Collecting Analyze

13 Materials & Methods: Analysis of NO 2 Method of calculating NO2 concentration 1 Making calibration curve 2 Measuring absorbance of solution with unknown concentration 3 Calculating NO 2 by using calibration curve Samples of PS spectrophotometer Analysis the absorbency of 545 nm Calibration curve

14 Materials & Methods: Traffic census Category Where When Standard-size vehicle, Heavy duty and Motorbike Busy street(nvc) and quiet street(chi s house) A weekday and a holiday For 5min. par 1h in the daytime / par 2h at night com 具 14 Picture of traffic survey

15 Counting number of traffics

16 Results & Discussions

17 Results & Discussions: NO2 Big Highway Average 8.8 ppb Near Big highway, NO 2 Concentration was higher than at places of central city There are many crowded street Chi s house NVC 2 km

18 Results & Discussions: NO2 2 年前のデータとの比較 Range were different!! Because of? A lot of rain!! Distribution of NO 2 didn t change since 2014 But Amount of NO 2 was much less than 2014.

19 Results & Discussions: NH3 19 < NH 3 > < NO 2 > NH3 ppb 0 to 2 2 to 4 4 to 6 6 to 8 8~ NH 3 と NO 2 で濃度の高いポイントは一致している 住居区域の NH 3 基準は 1 ppm=1000 ppb 悪臭物質として NH 3 の影響はない

20 PM2.5 ppbv ppbv Results & Discussions PM2.5 HNO3 HONO 20 Place of active samplers on NO 2 Map 日本の平均 0.5 ppbv μg/m PM2.5 日本の環境基準 35 μg/m 3 (1 年平均 ) 15 μg/m 3 (1 日平均 ) point 1 point 2 point 3 point 4 2 年前 20~100 μg/m 3 日本の平均 1 ppbv 0 point 1 point 2 point 3 point 4 0 point 1 point 2 point 3 point 4 HNO3 2 年前 0~4 ppbv HONO 2 年前 2~8 ppbv

21 Average number of vehicle (/5 min) Standard Heavy duty Motorbike Results & Discussions: Counting traffic Chi s house NVC The number of Motorbike was very High!!!

22 The number of motorbike (/5min) Results & Discussions: Counting traffic NVC Rush Rainstorm Rainstorm In the morning and evening of weekdays, motorbikes were more than weekend because of commuter rush.

23 Estimated number of vehicle (/ hour) Results & Discussions: Counting traffic and NO 2 concentration Rainstorm Rainstorm 8/28 8/29 8/30 Time change of traffic and NO 2 concentration had similar trend. After rainstorm, NO 2 concentration decreased.

24 Conclusion 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 NO 2 Concentration time change was related to the number of vehicles. Future works We have to collect more traffic data at many places to identify the factor of air pollution more clearly.

25 25 Thank you for your listening

26 Remark 26 Acceptable human error