India the ambient atmospheric conditions have progressively deteriorated due to urbanization, industrial development, lack of awareness, poor maintenance of motor vehicles, and poor road conditions. Transport vehicles and industrial emissions are the major sources of pollutants in the earth’s atmosphere. Among the various air pollutants from various sources particulate matter, sulfur dioxide, oxides of nitrogen, carbon monoxide are having a significant role in affecting the air quality and thereby causing harm to human health. Hence, these parameters were considered to determine the air quality of India. The objective of this paper is to provide insight details about the current situation of air quality across various cities present in India, along with countless origins and effects of air pollution. An attempt is made to make people aware about various types of gases and particulate matter present in air highlighting their effects on the environment along with the various ways of overcoming this situation during the lockdown COVID19 period, which was started on 22March2020, using the Air Quality Indexis proposed for the seven major cities of India, for simplified public information and data interpretation. The 24-hourly average concentrations of six major criteria pollutants, viz. Particulate matter PM10, PM2.5, Sulfur Dioxide (SO2), and Nitrogen Dioxide (NO2) carbon monoxide and two meteorological parameters, e.g., Humidity and Temperature for the year 2018, 2019, 2010 (January, February, March and April). During the study of the meteorological parameter we observed that, there are no changes in temperature, the humidity level is also not getting any significant changes in the overall cities. Particular Matter (PM10 and PM2.5) both parameters are decreasing overall selected cities, especially in March and April month. Ozone activities are also decreasing as compared with 2018 and 2019 data, during the study of all cities. Nitrogen dioxide levels is decreasing for all cities during these periods. The sulfur dioxide level is decreasing for all cities exceptional Bengaluru city their sulfur dioxide level is very low. The carbon monoxide level is decreasing overall cities during the March and April month.
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