scholarly journals The Occurrence of Heavy Air Pollution during the COVID-19 Outbreak in Beijing, China: Roles of Emission Reduction, Meteorological Conditions, and Regional Transport

2021 ◽  
Vol 13 (21) ◽  
pp. 12312
Author(s):  
Xiao Yan ◽  
Aijun Shi ◽  
Jingyuan Cao ◽  
Tingting Li ◽  
Xuesong Sun ◽  
...  

To prevent the spread of coronavirus disease (COVID-19) and mitigate the epidemic risk, strict lockdown measures were implemented in Beijing during the quarantine period, significantly reducing human activities. However, severe air pollution episodes occurred frequently in Beijing. To explore the occurrence of severe air pollution during the quarantine period, the impacts of emission reductions, meteorological conditions, and regional transport on heavy air pollution were individually evaluated using the Community Multiscale Air Quality (CMAQ) model. Observations showed that the more unfavorable meteorological conditions which occurred during the pandemic as compared to the corresponding 2019 levels, including higher temperature, relative humidity, and frequency of strong southerly winds, and lower HPBL, led to an increase in PM2.5 concentrations. The model results also showed that the meteorological conditions in February 2020 favored PM2.5 formation. The PM2.5 concentrations were mainly dominated by regional transport, which became more significant in the quarantine period than in 2019, suggesting the importance of joint control on regional sources for reducing heavy air pollution. This study highlights that, although the emissions in Beijing and surrounding regions were largely reduced during the quarantine period, severe air pollution in Beijing did not reduce due to the unfavorable meteorological conditions.

2016 ◽  
Vol 16 (4) ◽  
pp. 977-989 ◽  
Author(s):  
Shenshen Li ◽  
Zongwei Ma ◽  
Xiaozhen Xiong ◽  
David C. Christiani ◽  
Zhaoxi Wang ◽  
...  

2021 ◽  
Vol 249 ◽  
pp. 118249
Author(s):  
Mathilde Pascal ◽  
Vérène Wagner ◽  
Anna Alari ◽  
Magali Corso ◽  
Alain Le Tertre

2018 ◽  
Vol 69 ◽  
pp. 141-154 ◽  
Author(s):  
Nianliang Cheng ◽  
Yunting Li ◽  
Bingfen Cheng ◽  
Xin Wang ◽  
Fan Meng ◽  
...  

2006 ◽  
Vol 49 (1) ◽  
pp. 60-64 ◽  
Author(s):  
Che-Ming CHANG ◽  
Long-Nan CHANG ◽  
Hui-Chuan HSIAO ◽  
Fang-Chuan LU ◽  
Ping-Fei SHIEH ◽  
...  

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