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The total BTEX (\u2211BTEX) concentrations were 11.5\u00a0\u00b1\u00a09.0, 15.7\u00a0\u00b1\u00a016, 5.3\u00a0\u00b1\u00a05.0, 2.9\u00a0\u00b1\u00a02.0, and 0.93\u00a0\u00b1\u00a01.2\u00a0ppbv in January\u2013May 2020, respectively. The evening rush hour peaks of BTEX during lockdown decreased by 4\u20135 times from the same period of years 2014\u20102015\u20102018. A significant decline in background concentrations suggests a regional\u2010scale reduction in anthropogenic emissions. The contributions of \u2211TEX compounds to \u2211BTEX increased from 42% to 59% in winter to 64%\u201375% during the lockdown under hot summer conditions. While emission reductions dominated during the lockdown period, the meteorological and photochemical factors may also have contributed. Meteorological influence on actual observed BTEX data was removed by normalizing with ventilation coefficient (VC). The actual ambient air reductions of 85%\u201390% and VC\u2010normalized reductions of 54%\u201388% of the BTEX concentrations during lockdown were estimated compared to those during the same period of 2014\u20102015\u20102018. The estimated changes using nighttime data, which take into account BTEX photooxidation removal, are \u223c8% lower than the VC\u2010normalized estimates using all data. These significant reductions in BTEX concentrations are consistent with the change in people's movement as inferred from mobility data during the lockdown. Although enforced, the significant decline in ambient BTEX levels during lockdown was a good change for the air quality. The study suggests a need for more effective science\u2010based policies that consider local and regional factors.<\/jats:p>","DOI":"10.1029\/2022jd036628","type":"journal-article","created":{"date-parts":[[2022,3,14]],"date-time":"2022-03-14T05:59:30Z","timestamp":1647237570000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":36,"title":["Impact of COVID\u201019 Pandemic Lockdown in Ambient Concentrations of Aromatic Volatile Organic Compounds in a Metropolitan City of Western India"],"prefix":"10.1029","volume":"127","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6774-0546","authenticated-orcid":false,"given":"L. 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