气候变化领域集成服务门户(CCPortal): Impact of reduced anthropogenic emissions during COVID-19 on air quality in India

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DOI	10.5194/acp-21-4025-2021
	Impact of reduced anthropogenic emissions during COVID-19 on air quality in India
	Zhang M.; Katiyar A.; Zhu S.; Shen J.; Xia M.; Ma J.; Harsha Kota S.; Wang P.; Zhang H.
发表日期	2021
ISSN	1680-7316
起始页码	4025
结束页码	4037
卷号	21 期号:5
英文摘要	To mitigate the impacts of the pandemic of coronavirus disease 2019 (COVID-19), the Indian government implemented lockdown measures on 24 March 2020, which prohibited unnecessary anthropogenic activities, thus leading to a significant reduction in emissions. To investigate the impacts of this lockdown measure on air quality in India, we used the Community Multi-Scale Air Quality (CMAQ) model to estimate the changes of key air pollutants. From pre-lockdown to lockdown periods, improved air quality is observed in India, indicated by the lower key pollutant levels such as PM 2.5 (-26 %), maximum daily 8 h average ozone (MDA8 O3) (-11 %), NO2 (-50 %), and SO2 (-14 %). In addition, changes in these pollutants show distinct spatial variations with the more important decrease in northern and western India. During the lockdown, our results illustrate that such emission reductions play a positive role in the improvement of air quality. Significant reductions of PM2.5 concentration and its major components are predicted, especially for secondary inorganic aerosols that are up to 92 %, 57 %, and 79 % for nitrate (NO-3), sulfate (SO2 4-), and ammonium (NHC 4), respectively. On average, the MDA8 O3 also decreases 15 % during the lockdown period although it increases slightly in some VOC-limited urban locations, which is mainly due to the more significant reduction of NOx than VOCs. More aggressive and localized emission control strategies should be implemented in India to mitigate air pollution in the future. © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	air quality; anthropogenic source; atmospheric modeling; atmospheric pollution; COVID-19; emission control; viral disease; volatile organic compound; India; Coronavirus
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/247056
作者单位	Department of Environmental Science and Engineering, Fudan University, Shanghai, 200438, China; Department of Civil Engineering, Indian Institute of Technology, Delhi, 110016, India; School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, 99907, Hong Kong; Institute of Eco-Chongming (IEC), Shanghai, 200062, China
推荐引用方式 GB/T 7714	Zhang M.,Katiyar A.,Zhu S.,et al. Impact of reduced anthropogenic emissions during COVID-19 on air quality in India[J],2021,21(5).
APA	Zhang M..,Katiyar A..,Zhu S..,Shen J..,Xia M..,...&Zhang H..(2021).Impact of reduced anthropogenic emissions during COVID-19 on air quality in India.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(5).
MLA	Zhang M.,et al."Impact of reduced anthropogenic emissions during COVID-19 on air quality in India".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.5(2021).