An assessment of the impact of a nation-wide lockdown on air pollution &ndash; a remote sensing perspective over India

doi:10.5194/acp-2020-621

GSTDTAP > 地球科学

DOI	10.5194/acp-2020-621
	An assessment of the impact of a nation-wide lockdown on air pollution - a remote sensing perspective over India
	Mahesh Pathakoti, Aarathi Muppalla, Sayan Hazra, Mahalakshmi Dangeti, Raja Shekhar, Srinivasulu Jella, Sesha Sai Mullapudi, Prasad Andugulapati, and Uma Vijayasundaram
	2020-07-13
发表期刊	Atmospheric Chemistry and Physics
出版年	2020
英文摘要	The nation-wide lockdown imposed over India from 25th March 2020 onwards, in response to the COVID-19 pandemic, placed severe restrictions upon the industrial and transport sectors, which together form a significant chunk of anthropogenic emissions of pollutants into the atmosphere. Atmospheric concentrations of Nitrogen dioxide (NO₂), carbon monoxide (CO) and aerosol optical depth (AOD) for lockdown and pre-lockdown periods were investigated with observations from Aura/OMI, Terra/MOPITT, Sentinel-5p/TROPOMI and Aqua-Terra/MODIS satellite sensors. Mean NO₂ levels over India during the lockdown period showed a dip of 17 % as compared to pre-lockdown period and a decrease of 18 % against the 5-year average. Over New Delhi in particular, there was a sharp decrease of 62 % in NO₂ levels as compared to 2019 and a decline by 54 % relative to the preceding 5-year period (2015–2019). Aerosol levels reduced over the country by ~ 24 % from the 5-year mean levels, with a marked reduction over the Indo-Gangetic plains region. An increase in CO levels was noticeable, probably due to its longer life-time as compared to NO₂ and aerosols. This study also reports the rate of change of NO₂, CO and AOD, indicating increase/decrease in pollutant emissions over the different states of India.
领域	地球科学
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/284231
专题	地球科学
推荐引用方式 GB/T 7714	Mahesh Pathakoti, Aarathi Muppalla, Sayan Hazra, Mahalakshmi Dangeti, Raja Shekhar, Srinivasulu Jella, Sesha Sai Mullapudi, Prasad Andugulapati, and Uma Vijayasundaram. An assessment of the impact of a nation-wide lockdown on air pollution - a remote sensing perspective over India[J]. Atmospheric Chemistry and Physics,2020.
APA	Mahesh Pathakoti, Aarathi Muppalla, Sayan Hazra, Mahalakshmi Dangeti, Raja Shekhar, Srinivasulu Jella, Sesha Sai Mullapudi, Prasad Andugulapati, and Uma Vijayasundaram.(2020).An assessment of the impact of a nation-wide lockdown on air pollution – a remote sensing perspective over India.Atmospheric Chemistry and Physics.
MLA	Mahesh Pathakoti, Aarathi Muppalla, Sayan Hazra, Mahalakshmi Dangeti, Raja Shekhar, Srinivasulu Jella, Sesha Sai Mullapudi, Prasad Andugulapati, and Uma Vijayasundaram."An assessment of the impact of a nation-wide lockdown on air pollution – a remote sensing perspective over India".Atmospheric Chemistry and Physics (2020).