气候变化领域集成服务门户(CCPortal): Diurnal and temporal changes in air pollution during COVID-19 strict lockdown over different regions of India

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DOI	10.1016/j.envpol.2020.115368
	Diurnal and temporal changes in air pollution during COVID-19 strict lockdown over different regions of India
	Singh V.; Singh S.; Biswal A.; Kesarkar A.P.; Mor S.; Ravindra K.
发表日期	2020
ISSN	2697491
卷号	266
英文摘要	Lockdown measures to contain COVID-19 pandemic has resulted in a considerable change in air pollution worldwide. We estimate the temporal and diurnal changes of the six criteria air pollutants, including particulate matter (PM2.5 and PM10) and gaseous pollutants (NO2, O3, CO, and SO2) during lockdown (25th March – 3rd May 2020) across regions of India using the observations from 134 real-time monitoring sites of Central Pollution Control Board (CPCB). Significant reduction in PM2.5, PM10, NO2, and CO has been found in all the regions during the lockdown. SO2 showed mixed behavior, with a slight increase at some sites but a comparatively significant decrease at other locations. O3 also showed a mixed variation with a mild increase in IGP and a decrease in the South. The absolute decrease in PM2.5, PM10, and NO2 was observed during peak morning traffic hours (08–10 Hrs) and late evening (20–24 Hrs), but the percentage reduction is almost constant throughout the day. A significant decrease in day-time O3 has been found over Indo Gangetic plain (IGP) and central India, whereas night-time O3 has increased over IGP due to less O3 loss. The most significant reduction (∼40–60%) was found in PM2.5 and PM10. The highest decrease in PM was found for the north-west and IGP followed by South and central regions. A considerable reduction (∼30–70%) in NO2 was found except for a few sites in the central region. A similar pattern was observed for CO having a ∼20–40% reduction. The reduction observed for PM2.5, PM10, NO2, and enhancement in O3 was proportional to the population density. Delhi's air quality has improved with a significant reduction in primary pollutants, however, an increase in O3 was observed. The changes reported during the lockdown are combined effect of changes in the emissions, meteorology, and atmospheric chemistry that requires detailed investigations. © 2020 Elsevier LtdFirst comprehensive study representing over 130 sites over India to Assess the changes in spatial, Temporal patterns in pollution during lockdown to support future mitigation strategies © 2020 Elsevier Ltd
英文关键词	Air quality; Delhi; Ozone; Particulate matter; Pollution reduction; Traffic emissions
scopus关键词	Air quality; Atmospheric chemistry; Fog; Nitrogen oxides; Population statistics; Central pollution control boards; Criteria air pollutants; Indo-Gangetic Plains; Mitigation strategy; Particulate Matter; Population densities; Primary pollutants; Real time monitoring; Air pollution control; carbon monoxide; nitrogen dioxide; ozone; sulfur dioxide; atmospheric pollution; carbon monoxide; COVID-19; diurnal variation; nitrogen dioxide; ozone; particulate matter; sulfur dioxide; temporal variation; air pollutant; air pollution; air quality; Article; coronavirus disease 2019; environmental monitoring; India; particulate matter; population density; reduction (chemistry); traffic; air pollution; Betacoronavirus; Coronavirus infection; human; pandemic; virus pneumonia; India; Air Pollutants; Air Pollution; Betacoronavirus; Coronavirus Infections; Environmental Monitoring; Humans; India; Pandemics; Particulate Matter; Pneumonia, Viral
来源期刊	Environmental Pollution
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176766
作者单位	National Atmospheric Research Laboratory, Gadanki, AP, India; Department of Environment Studies, Panjab University, Chandigarh, 160014, India; Department of Community Medicine and School of Public Health, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India
推荐引用方式 GB/T 7714	Singh V.,Singh S.,Biswal A.,et al. Diurnal and temporal changes in air pollution during COVID-19 strict lockdown over different regions of India[J],2020,266.
APA	Singh V.,Singh S.,Biswal A.,Kesarkar A.P.,Mor S.,&Ravindra K..(2020).Diurnal and temporal changes in air pollution during COVID-19 strict lockdown over different regions of India.Environmental Pollution,266.
MLA	Singh V.,et al."Diurnal and temporal changes in air pollution during COVID-19 strict lockdown over different regions of India".Environmental Pollution 266(2020).