Publication:
Air quality improvement during covid-19 lockdown in bangkok metropolitan, thailand: Effect of the long-range transport of air pollutants

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Issued Date

2021

Resource Type

Article

Language

eng

File Type

application/pdf

ISSN

16808584

DOI

10.4209/aaqr.200662

Other identifier(s)

2-s2.0-85109945392

Rights Holder(s)

มหาวิทยาลัยศรีนครินทรวิโรฒ

Bibliographic Citation

Aerosol and Air Quality Research. Vol 21, No.7 (2021)

Suggested Citation

Wetchayont P., Hayasaka T., Khatri P. Air quality improvement during covid-19 lockdown in bangkok metropolitan, thailand: Effect of the long-range transport of air pollutants. Aerosol and Air Quality Research. Vol 21, No.7 (2021). doi:10.4209/aaqr.200662 Retrieved from: https://hdl.handle.net/20.500.14740/8016

Title

Air quality improvement during covid-19 lockdown in bangkok metropolitan, thailand: Effect of the long-range transport of air pollutants

Author(s)

Wetchayont P.
 Hayasaka T.
 Khatri P.

Abstract

Lockdown measures have been adopted in many countries worldwide due to the onset of the COVID-19 pandemic, including in Thailand. Air quality improvements with regard to restrictions of daily movement among Bangkok people have been reported. This study explores the impact of the COVID-19 outbreak and long-range pollution on air quality in Bangkok Metropolitan, Thailand by using ground-based and satellite measurements such as MODIS and TROPOMI data. Moreover, the results project some possible future trends of air quality in Bangkok Metropolitan. The 24-hr average concentrations of PM2.5, O3, NO2, CO and SO2 were compared between the periods of Normal, Lockdown and New Normal. PM2.5 concentrations increased by 20.56% during the Normal period and decreased by –15.79% and –23.34% during the Lockdown and New Normal periods, respectively, compared to the same periods in 2017–2019. There were also significant decreasing trends in O3: –7.13% and 4.72%; and CO: –8.01% and 23.59% during the Lockdown and New Normal periods, respectively, while NO2 and SO2 concentrations showed increasing trends during the three periods. The MODIS and TROPOMI data analyses indicate the COVID-19 outbreak has had significant positive impact on surface pollution, but no impact on upper atmospheric pollution due to added pollution from long-range transport. The results also demonstrate that surface air pollution had a combination effect from biomass burning, traffic, industrial and household sources during the Lockdown period, except for SO2 concentrations, which were attributed to long-range transport pollution loading. In some cases, a negative impact of the COVID-19 lockdown on air pollution can be observed due to certain activities increasing within Bangkok Metropolitan. Additionally, the results also show that changing the lifestyle into a “new normal” for people in Bangkok after the Lockdown period has had a positive effect on air pollution. © 2021, AAGR Aerosol and Air Quality Research. All rights reserved.

Subject(s)

Nitrogen oxides
 Radiometers
 Sulfur dioxide
 Air quality improvement
 Atmospheric pollution
 Average concentration
 Combination effects
 Impact on surfaces
 Long range transport
 PM2.5 concentration
 Satellite measurements
 Air quality
 Air quality
 Atmospheric pollution
 Carbon monoxide
 Concentration (composition)
 COVID-19
 Epidemic
 Long range transport
 Metropolitan area
 MODIS
 Nitrogen dioxide
 Ozone
 Particulate matter
 Satellite data
 Sulfur dioxide
 Bangkok
 Central Region [Thailand]
 Krung Thep Mahanakhon
 Thailand

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URI

https://hdl.handle.net/20.500.14740/8016

Collections

Scopus: Year 1983-2021

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