Creating air pollution map and analyzing traffic survey ... · PDF file Emission from motor...

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Transcript of Creating air pollution map and analyzing traffic survey ... · PDF file Emission from motor...

  • 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

    3

  • Materials & Methods

    to identify the factor of air pollution clearly

    4

    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

    2

    34

    1 4

    6

    1 5

    1 9

    9

    2 0

    1 1

    1 2

    4 2

    1 6 1

    3

    2 8

    1

    2 5

    2 22

    32 7

    1 7

    1 8

    4 5

    2 6

    2 1

    4 3

    3 9

    4 7

    4 8

    4 4

    4 6

    4 9

    3 5

    3 6

    3 4

    3 3

    3 7

    3 1

    3 2

    4 0

    4 1

    8

    1 0

    5 2 4

    3 0

    7

    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

    Air height : 19 mm diameter : 30 mmφ

    pore size:1.0 mm

    remove particles and water drop

    Teflon filter

    Filter include chemical

    To catch NH3 → 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 filter Dalat travel

    25

    26 Change filter City tour & Culture exchange 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. 8 Dist. 7

    Dist. 5

    Dist. 12

    Thu Duc Dist.

    Binh Chanh Dist.

    Hoc Mon Dist.

    Binh Thanh Dist.

    Phu Nhuan Dist.

    Go Vap Dist.

    NH3 ppb 75 ~

    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 ppb 75 ~

    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 ppb 75 ~

    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 ppb 30 ~

    20 to 30

    10 to 20

    0 to 10

  • 15

    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

    12000 Bike / Monday to South

    0

    2000

    4000

    6000

    8000

    10000

    12000

    27/8/2018

    28/8/2017

    29/8/2016

    Bike / Monday to North

    N u

    m b

    e r

    o f

    v ie

    c le

    s / h

    o u

    r Result: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.

    19