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Choi, Sung-Deuk
Environmental Analytical Chemistry Lab (EACL)
Research Interests
  • Persistent organic pollutants, Environmental Analysis and monitoring, Multimedia modeling, Fine particle

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Spatial and temporal variations of the PM2.5 concentrations in Hanoi metropolitan area, Vietnam, during the COVID-19 lockdown

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Title
Spatial and temporal variations of the PM2.5 concentrations in Hanoi metropolitan area, Vietnam, during the COVID-19 lockdown
Author
Vuong, Quang TranChoi, Sung-DeukBac, Vuong ThuThang, Hoang MinhHue, Nguyen ThiThu Lan, TranHanh, Duong ThiTuyen, Trinh VanThang, Phan Quang
Issue Date
2021-06
Publisher
TAYLOR & FRANCIS LTD
Citation
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
Abstract
The Vietnamese government has issued several directives of lockdown in Hanoi, the capital city, for a month (1-30 April 2020) to prevent the human-to-human transmission of COVID-19. This action has affected air pollution due to a decline in transportation. Therefore, this study investigates spatial and temporal change in the PM2.5 concentrations during the first 4 months of 2020 in Hanoi metropolitan area. Spatial distribution maps of the PM2.5 concentration in Hanoi were provided for the first time. The average PM2.5 concentrations at the 22 air monitoring stations were strongly correlated with the population. April had a significantly lower level of PM2.5 than the other 3 months. In particular, the concentrations of PM2.5 and NO2 decreased by 12 and 54%, respectively, between March and April, especially at areas for commercial activities. In April, a higher level of PM2.5 was recorded between Tuesday-Thursday, which is a reverse trend with that in March. Furthermore, Monday and Friday did not show rush hour peaks for the PM2.5 levels in April. A decrease in the PM2.5 concentrations was partly influenced by the long-range transport from the outside to Hanoi. This study implies that a reduction in traffic volumes and public activities may possibly improve the air quality.
URI
https://scholarworks.unist.ac.kr/handle/201301/55934
URL
https://www.tandfonline.com/doi/full/10.1080/03067319.2021.1941918
DOI
10.1080/03067319.2021.1941918
ISSN
0306-7319
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