“…Thus, COVID-19 pandemic has proved to be a 'blessing in disguise' which can help earth to revive and improve air quality [35] which has been supported by many research studies conducted in different parts of the world [1,5,6,9,12,13,23,28,32,33,35,36,42,43,48,55,57,58,61,63,69,75]. Further it has been found that places where the air pollution was high, deaths rate due to COVID-19 also enhanced [13,23,32,48,69,75]. In India, the concentration of sulphur dioxide between April 2019 and April 2020 decreased by around 40% [19] as shown in Fig.…”