Social restriction effects on air pollution: how the pm2.5 concentration changed with lockdown management of covid-19 pandemic control in bangkok thailand
Thae Thae Han Htwe, Sarawut Thepanondh, Suphaphat Kwonpongsagoon, Chutarat Chompunth, and Kanisorn Jindamanee
Under rapid proceeding of COVID-19 pandemic, Thailand government announced lockdown
and social restriction in March 2020. With the frustration of pandemic, anthropogenic etiology
of air pollution was benefi cially assessed on other hands. The study aims at exploring how
PM2.5 concentration changed with lockdown management and social restriction as part
of COVID-19 control in the Bangkok Metropolitan Region, Thailand. There was PM2.5
concentration reduction of roadside (18.6%) and ambient (9.2%) in COVID-19 lockdown
period than the same months of previous consecutive year. Moreover, this study showed
a clear decline of PM2.5 during lockdown in both rush and non-rush hours except one
roadside area which has a non-significant rising PM2.5 because of trucks activities in
some area. Additionally, the probable high concentration during the lockdowns period
occurred at calm wind speed, mostly from the south direction, particularly in roadside
area indicating the traffi c source of PM2.5 in the Conditional Bivariate Probability Function
(CBPF) plot which estimate probable direction and source of air pollutant. Although PM2.5
is signifi cantly reduced in the lockdown period, it is still above 66% (33 microgram per
cubic meter) of the Thailand standard in CBPF analysis.etc...
Keywords
PM2.5; CBPF; COVID-19; Bangkok Metropolitan Region (BMR); Thailand
ENIVRONMENT ASIA
Published by : Thai Society of Higher Education Institutes on Environment Contributions welcome at : http://www.tshe.org/en/
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