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IMPACT OF THE COVID-19 LOCKDOWN ON AIR POLLUTION IN AN INDUSTRIAL CITY IN NORTHEASTERN CHINA.
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- Author(s): Xueyan WANG1; Yuqing WANG1; Yiran ZHAO1; Meijin TIAN1; Xinmeng WU1; Yongzhen ZHANG1; Feng GAO1; Junjiao SUN1; Xiaoqing WEI1; Xiuying YANG1; Xiaohan QU1
- Source:
Journal of Environmental Engineering & Landscape Management. 2023, Vol. 31 Issue 3, p219-231. 13p.- Subject Terms:
- Source:
- Additional Information
- Subject Terms:
- Abstract: Many studies in China investigated how the lockdown following the coronavirus disease 2019 substantially affected air quality; however, few were conducted in Northeastern China. Here, the changes in six criteria air pollutants, including particulate matter (PM10 and PM2.5), nitrogen dioxide (NO2), carbon monoxide (CO), sulfur dioxide (SO2), and ozone (O3), were investigated in Shenyang from January to May 2015-2020. Compared with the pre-lockdown, the mass concentrations of PM2.5, PM10, SO2, NO2, and CO during the lockdown decreased by 40.3% to 48.6%, indicating a positive impact of lockdown policies on reducing pollutant emissions. The responses of PM2.5, PM10, and CO to the lockdown measures in downtown areas were more sensitive than in the suburbs. However, the O3 concentration showed the opposite trend, attributed to the drop in NOx and particulate matters. Compared to the same period in 2015-2019, the proportion of days with good air quality increased from 63.2% to 77.2% during the lockdown and Shenyang experienced no severe pollution. Our results suggest that reducing human activities can improve air quality; however, coordinated control policies of O3, PM2.5, and NO2 are imperative. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Journal of Environmental Engineering & Landscape Management is the property of Vilnius Gediminas Technical University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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