气候变化领域集成服务门户(CCPortal): Effects of COVID-19 pandemic on the air quality of three megacities in India

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DOI	10.1016/j.atmosres.2021.105659
	Effects of COVID-19 pandemic on the air quality of three megacities in India
	Mandal J.; Samanta S.; Chanda A.; Halder S.
发表日期	2021
ISSN	0169-8095
卷号	259
英文摘要	COVID-19 pandemic compelled many countries in the world to go for a nationwide lockdown to prevent the spread of the coronavirus. India started the lockdown on 24 March 2020. We analyzed the air quality of three megacities of India, namely Mumbai, Delhi, and Kolkata, during the lockdown phase and compared it with the pre-lockdown and post-lockdown scenarios. We considered seven major air pollutants: PM2.5, PM10, NO2, NH3, SO2, CO, and O3. We analyzed the data acquired from 56 automatic air-monitoring stations (AAMS) under the Central Pollution Control Board (CPCB) spread across the megacities. The air pollution level in the eastern part of Mumbai and the western part of Delhi and Kolkata usually remains high. Delhi was the worst polluted megacity, followed by Kolkata and Mumbai. The stop of vehicular movements and industrial lockdown across the nation has substantial effects on the environment, especially in the atmosphere near the Earth's surface. Our analysis showed significant improvements in air quality during the period of lockdown (25 March to 14 April 2020) compared to the pre-lockdown phase (3 March to 23 March 2020) and the same time window of the previous year (25 March to 14 April 2019). The post-lockdown (15 April to 5 May) phase exhibited mixed results. We mapped the spatial pattern of these pollutants and the air quality index (AQI). According to CPCB, PM2.5, PM10, and CO are the major air pollutants in India that reduced by 47%, 41%, and 27% in Mumbai; 52%, 39%, and 13% in Delhi; and 49%, 37%, and 21% in Kolkata, respectively, in the lockdown phase. PM2.5, PM10, and NO2 exhibited significant correlations across the three megacities. This study shows that occasional short-term lockdowns can effectively refresh the air in these megacities. © 2021 Elsevier B.V.
英文关键词	Air Quality; COVID-19; India; Lockdown; Megacities; Pollutants
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236718
作者单位	Department of Geography, Purash Kanpur Haridas Nandi Mahavidyalaya, Vill. Purash, P.O. Kanpur, Dist., Howrah, West Bengal 711410, India; School of Oceanographic Studies, Jadavpur University, 188, Raja S. C. Mullick Road, Kolkata, West Bengal 700 032, India; Department of Ecology, Physical and Human Resources, Netaji Institute For Asian Studies, 1, Woodburn Park, Kolkata, West Bengal 700020, India
推荐引用方式 GB/T 7714	Mandal J.,Samanta S.,Chanda A.,et al. Effects of COVID-19 pandemic on the air quality of three megacities in India[J],2021,259.
APA	Mandal J.,Samanta S.,Chanda A.,&Halder S..(2021).Effects of COVID-19 pandemic on the air quality of three megacities in India.Atmospheric Research,259.
MLA	Mandal J.,et al."Effects of COVID-19 pandemic on the air quality of three megacities in India".Atmospheric Research 259(2021).