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ENIVRONMENT ASIA


Volume 14, No. 03, Month SEPTEMBER, Year 2021, Pages 80 - 90


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


Abstract Download PDF

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
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