Immediate lockdown (March 24-May 31, 2020) of industrial activity and traffic flows has been announced by the government of India across the country after the declaration of World Health Organization that the Novel Coronavirus (SARS-CoV-2) outbreak is pandemic. In this study, we tried to estimate the air quality improvement during the pre-lockdown period (January 1-March 23, 2020) by comparing the lockdown period (March 24-May 31, 2020). From the results, we found the highest reduction in the concentration of NO 2 (81.98%) during the lockdown period. The average concentration of NO 2 was 51.57 µg/m 3 during pre-lockdown has changed to 9.29 µg/m 3. The average PM 2.5 concentration was 80.09 µg/m 3 during the pre-lockdown period has reduced to 20.24 µg/m 3 with 74.72% of reduction during the lockdown period. From the overall analysis of various parameters, we observed significant improvement with the range of 73.