SEASONAL PATTERNS OF PM2.5 CONCENTRATION IN DELHI TECHNOLOGICAL UNIVERSITY CAMPUS

Abstract

The average concentration of pollutant PM2.5 during monsoon (August to September 2017), post monsoon (October to November 2017), winter (December 2017 to January 2018) and summer (April to May 2018) was observed at DTU Delhi for four hour (12pm to 4 pm). The seasonal analysis reveals that the concern pollutant i.e. PM2.5 concentration is higher in winter and lowest in monsoon and moderate in summer. The concentration of PM2.5 is higher in winter due to the limited pollutant dispersion and lower concentration during monsoon due to rainy season because in monsoon pollutants are wash out from atmosphere and deposited on the ground surface. The maximum concentration of PM2.5 found during the study is 528.50μg/m3 in winter and 29.35μg/m3in monsoon. The study reveals the comparative analysis of concentration of PM2.5 during past three years of Diwali. It was found that the average concentration of PM2.5 during Diwali days are 430 μg/m3 ,1237 μg/m3 and 657 μg/m3 in 2015, 2016 and 2017 respectively which is more than 8 to 20 times of standard values prescribed by NAAQS.