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

被引:8
|
作者
Yan, Xiao [1 ]
Shi, Aijun [2 ]
Cao, Jingyuan [3 ]
Li, Tingting [1 ]
Sun, Xuesong [1 ]
Zhang, Rui [1 ]
Qiu, Xionghui [4 ,5 ,6 ]
Li, Yanxue [7 ]
Liang, Miao [8 ]
Lv, Miao [9 ]
Liu, Chunlan [1 ]
Wei, Jing [10 ]
机构
[1] Beijing Municipal Res Inst Environm Protect, Natl Engn Res Ctr Urban Environm Pollut Control, Beijing 100037, Peoples R China
[2] Beijing Vehicle Emiss Management Ctr, Beijing 100176, Peoples R China
[3] North China Elect Power Univ, Coll Environm Sci & Engn, Beijing 102206, Peoples R China
[4] Beijing Jiaotong Univ, Inst Transport Energy & Environm, Beijing 100044, Peoples R China
[5] State Environm Protect Key Lab Sources & Control, Beijing 100084, Peoples R China
[6] Tsinghua Univ, Sch Environm, State Key Joint Lab Environm Simulat & Pollut Con, Beijing 100084, Peoples R China
[7] State Grid Integrated Energy Planning Design & Re, Beijing 100052, Peoples R China
[8] China Meteorol Adm, Meteorol Observat Ctr, Beijing 100081, Peoples R China
[9] CEPEC Talroad Technol CO Ltd, Beijing 100085, Peoples R China
[10] Univ Iowa, Ctr Global & Reg Environm Res, Iowa Technol Inst, Dept Chem & Biochem Engn, Iowa City, IA 52242 USA
基金
中国国家自然科学基金;
关键词
heavy air pollution; COVID-19; meteorological conditions; regional transport; PM2.5; PM10; NO2;
D O I
10.3390/su132112312
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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.
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页数:12
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