Transformation of Air Quality over a Coastal Tropical Station Chennai during COVID-19 Lockdown in India
Abstract To prevent the spread of COVID-19, Government of India imposed strict lockdown in the country from 24 March–31 May 2020, which allows the environment to revive with reduced emissions. The present work analyses the PM2.5, NO2, O3, CO and SO2 along with meteorological parameters (humidity, te...
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| Format: | Article |
| Language: | English |
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Springer
2020-12-01
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| Series: | Aerosol and Air Quality Research |
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| Online Access: | https://doi.org/10.4209/aaqr.200490 |
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| author | Jyotsna Singh Bhishma Tyagi |
| author_facet | Jyotsna Singh Bhishma Tyagi |
| author_sort | Jyotsna Singh |
| collection | DOAJ |
| description | Abstract To prevent the spread of COVID-19, Government of India imposed strict lockdown in the country from 24 March–31 May 2020, which allows the environment to revive with reduced emissions. The present work analyses the PM2.5, NO2, O3, CO and SO2 along with meteorological parameters (humidity, temperature and wind speed) at a tropical coastal station Chennai for March-May 2019 and 2020 at five locations: Alandur Bus depot, Velachery, Manali, Teynampet and U.S. Embassy Chennai. Chennai is a megacity of southern India and the state capital of Tamil Nadu, one of the worst affected states due to COVID-19. Though overall PM2.5 values decreased for the 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 were found to change for transporting pollution to the site. The analysis shows there are local scale variations in the air pollution for the city during COVID-19 lockdown. |
| format | Article |
| id | doaj-art-00586f3e9419442099a986cefd31e4b1 |
| institution | DOAJ |
| issn | 1680-8584 2071-1409 |
| language | English |
| publishDate | 2020-12-01 |
| publisher | Springer |
| record_format | Article |
| series | Aerosol and Air Quality Research |
| spelling | doaj-art-00586f3e9419442099a986cefd31e4b12025-08-20T02:48:27ZengSpringerAerosol and Air Quality Research1680-85842071-14092020-12-0121411210.4209/aaqr.200490Transformation of Air Quality over a Coastal Tropical Station Chennai during COVID-19 Lockdown in IndiaJyotsna Singh0Bhishma Tyagi1Shanti Raj BhawanDepartment of Earth and Atmospheric Sciences, National Institute of Technology RourkelaAbstract To prevent the spread of COVID-19, Government of India imposed strict lockdown in the country from 24 March–31 May 2020, which allows the environment to revive with reduced emissions. The present work analyses the PM2.5, NO2, O3, CO and SO2 along with meteorological parameters (humidity, temperature and wind speed) at a tropical coastal station Chennai for March-May 2019 and 2020 at five locations: Alandur Bus depot, Velachery, Manali, Teynampet and U.S. Embassy Chennai. Chennai is a megacity of southern India and the state capital of Tamil Nadu, one of the worst affected states due to COVID-19. Though overall PM2.5 values decreased for the 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 were found to change for transporting pollution to the site. The analysis shows there are local scale variations in the air pollution for the city during COVID-19 lockdown.https://doi.org/10.4209/aaqr.200490COVID-19CWT analysisParticulate matterNitrogen dioxideSulphur dioxide |
| spellingShingle | Jyotsna Singh Bhishma Tyagi Transformation of Air Quality over a Coastal Tropical Station Chennai during COVID-19 Lockdown in India Aerosol and Air Quality Research COVID-19 CWT analysis Particulate matter Nitrogen dioxide Sulphur dioxide |
| title | Transformation of Air Quality over a Coastal Tropical Station Chennai during COVID-19 Lockdown in India |
| title_full | Transformation of Air Quality over a Coastal Tropical Station Chennai during COVID-19 Lockdown in India |
| title_fullStr | Transformation of Air Quality over a Coastal Tropical Station Chennai during COVID-19 Lockdown in India |
| title_full_unstemmed | Transformation of Air Quality over a Coastal Tropical Station Chennai during COVID-19 Lockdown in India |
| title_short | Transformation of Air Quality over a Coastal Tropical Station Chennai during COVID-19 Lockdown in India |
| title_sort | transformation of air quality over a coastal tropical station chennai during covid 19 lockdown in india |
| topic | COVID-19 CWT analysis Particulate matter Nitrogen dioxide Sulphur dioxide |
| url | https://doi.org/10.4209/aaqr.200490 |
| work_keys_str_mv | AT jyotsnasingh transformationofairqualityoveracoastaltropicalstationchennaiduringcovid19lockdowninindia AT bhishmatyagi transformationofairqualityoveracoastaltropicalstationchennaiduringcovid19lockdowninindia |