ArticleUrban climate2021
COVID-19 lockdown: Effects on selected volatile organic compound (VOC) emissions over the major Indian metro cities.
Article in Urban climate, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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Who cites it
9 citing papers in PubMed.
- A Three-Year Analysis of Toxic Benzene Levels and Associated Impact in Ploieşti City, Romania.Toxics · 2023Article
- Impacts of COVID-19's restriction measures on personal exposure to VOCs and aldehydes in Taipei City.The Science of the total environment · 2023Article
- Article
- Surface, satellite ozone variations in Northern South America during low anthropogenic emission conditions: a machine learning approach.Air quality, atmosphere, & health · 2023Article
- Temporary reduction in VOCs associated with health risk during and after COVID-19 in Maharashtra, India.Journal of atmospheric chemistry · 2023Article
- Indicators of Climate Change, Geospatial and Analytical Mapping of Trends in India, Pakistan and Bangladesh: An Observational Study.International journal of environmental research and public health · 2022Article
- The concentration of BTEX in selected urban areas of Malaysia during the COVID-19 pandemic lockdown.Urban climate · 2022Article
- NASA Satellite Measurements Show Global-Scale Reductions in Free Tropospheric Ozone in 2020 and Again in 2021 During COVID-19.Geophysical research letters · 2022Article
- Characteristic changes of ozone and its precursors in London during COVID-19 lockdown and the ozone surge reason analysis.Atmospheric environment (Oxford, England : 1994) · 2022Article
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3 authors.
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Abstract
Due to the COVID-19 pandemic, many countries across the world, including India, have imposed nationwide lockdowns to contain the spread of the virus. Many studies reported that the air quality had improved much due to the lockdown. This study examines the variation of Volatile Organic Compounds (VOCs) over the Indian metropolitan cities during the lockdown period by using ground-based and satellite observations. Ground-based BTEX (Benzene, Toluene, Ethylbenzene, and Xylenes) measurements from various metropolitan cities have shown a drastic drop of about 82% in the first phase of lockdown when compared with the pre-lockdown period. Whereas the spatial distribution of formaldehyde (HCHO), obtained from the TROPOspheric Monitoring Instrument (TROPOMI) onboard Sentinal-5P satellite, did not show any significant variation due to COVID-19 lockdown, indicating the major source of HCHO is biogenic or pyrogenic. The BTEX ratios were evaluated for a better understanding of the source and photochemical age of the air samples. The ozone forming potential of BTEX in all locations was found reduced; however, the corresponding decrease in ozone concentrations was not observed. The increase in ozone concentrations during the same period indicates alternative sources contributing to ozone formation.
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