A STUDY OF EFFECT OF RESTRICTIONS IMPOSED DUE TO COVID- 19 ON AMBIENT AIR QUALITY OF AJMER, RAJASTHAN, INDIA

Abstract

This study presents a trend analysis of variation in monthly average concentration of three pollutants namely PM10, PM2.5, NO2 at Civil Lines, Ajmer, Rajasthan, India between period of pre lockdown and lockdown i.e. from February 2020 to April 2020. The analysis of the data shows that the monthly average concentrations of all the three pollutants show a decreasing trend over the study period. The study also shows that concentration of PM2.5 was approximately halved, from 50.03 µg/m3 in February to 24.95 µg/m3 in April and it was found that the percentage decrease in PM10 and NO2 from February to April 2020 was 45.28% and 71.98%. The study also shows that the maximum decrease during the study period was observed for NO2 followed by PM2.5 and then PM10.