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标题：COVID-19 strict lockdown impact on urban air quality and atmospheric temperature in four megacities of India
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作者：Subodh Chandra Pal ; Indrajit Chowdhuri ; Asish Saha 等
期刊名称：Geoscience Frontiers
印刷版ISSN：1674-9871
出版年度：2022
卷号：13
期号：6
页码：1-12
DOI：10.1016/j.gsf.2022.101368
语种：English
出版社：Elsevier
摘要：Graphical abstractDisplay OmittedHighlights•Aerosol concentration reduced during lockdown period in four megacities.•Average PM2.5and PM10trend varied during lockdown period.•The other pollutants (CO, NO2, SO2and NH3) also show declining trend.•Atmospheric temperature of megacities reduced by 2–3 °C during COVID-19 lockdown.AbstractCOVID-19 pandemic has forced to lockdown entire India starting from 24th March 2020 to 14th April 2020 (first phase), extended up to 3rd May 2020 (second phase), and further extended up to 17th May 2020 (third phase) with limited relaxation in non-hotspot areas. This strict lockdown has severely curtailed human activity across India. Here, aerosol concentrations of particular matters (PM) i.e., PM10, PM2.5, carbon monoxide (CO), nitrogen dioxide (NO2), sulphur dioxide (SO2), ammonia (NH3) and ozone (O3), and associated temperature fluctuation in four megacities (Delhi, Mumbai, Kolkata, and Chennai) from different regions of India were investigated. In this pandemic period, air temperature of Delhi, Kolkata, Mumbai and Chennai has decreased about 3 °C, 2.5 °C, 2 °C and 2 °C respectively. Compared to previous years and pre-lockdown period, air pollutants level and aerosol concentration (−41.91%, −37.13%, −54.94% and −46.79% respectively for Delhi, Mumbai, Kolkata and Chennai) in these four megacities has improved drastically during this lockdown period. Emission of PM2.5has experienced the highest decrease in these megacities, which directly shows the positive impact of restricted vehicular movement. Restricted emissions produce encouraging results in terms of urban air quality and temperature, which may encourage policymakers to consider it in terms of environmental sustainability.
关键词：KeywordsenCOVID-19AerosolAir pollutantClimateMegacity