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标题：Transformation of Air Quality over a CoastalTropical Station Chennai during COVID-19Lockdown in India
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作者：Jyotsna Singh ; Bhishma Tyagi
期刊名称：Aerosol and Air Quality Research
印刷版ISSN：1680-8584
出版年度：2021
卷号：21
期号：4
页码：1-12
DOI：10.4209/aaqr.200490
语种：English
出版社：Chinese Association for Aerosol Research in Taiwan
摘要：To prevent the spread of COVID-19, Government of India imposed strict lockdown in thecountry from 24 March–31 May 2020, which allows the environment to revive with reducedemissions. The present work analyses the PM2.5, NO2, O3, CO and SO2 along with meteorologicalparameters (humidity, temperature and wind speed) at a tropical coastal station Chennai forMarch-May 2019 and 2020 at five locations: Alandur Bus depot, Velachery, Manali, Teynampetand U.S. Embassy Chennai. Chennai is a megacity of southern India and the state capital of TamilNadu, one of the worst affected states due to COVID-19. Though overall PM2.5 values decreased forthe lockdown (ranging from ~32–187%), weekly analysis shows the variation in reduction/increase.SO2 and O3 values were found increasing for two sites: Teynampet (~40% in SO2 and ~48% in O3)and Velachery (~42% in SO2 and ~5% in O3), but decreasing for Alandur (~30% in SO2 and ~50%in O3) and Manali (~247% in SO2). NOx and CO were reduced during the lockdown (~47–125%)for all the sites. The source regions examined by concentration weighted trajectory analysis werefound to change for transporting pollution to the site. The analysis shows there are local scalevariations in the air pollution for the city during COVID-19 lockdown.
关键词：COVID-19;CWT analysis;Particulate matter;Nitrogen dioxide;Sulphur dioxide