Characterisation of Carbonaceous Aerosol during Summer Monsoon and Winter Monsoon at an Industrial Region of Delhi, India
Abstract
PM10 samples were collected at an industrial region during covering summer monsoon and winter monsoon season in Delhi NCR, India. The 24-h mass concentrations of PM10 were significantly higher than the limit of prescribed by the National Ambient Air Quality Standards (Indian NAAQS) and 25 μg/m3 of those of the WHO (World Health Organization). The average mass concentrations of PM10 were 144.1±53.7 μg/m3, 210.4±50.7 μg/m3 and during summer monsoon and winter monsoon season respectively with an overall average of 174.6±64.0 μg/m3. The average observed concentrations of organic carbon and elemental carbon were 79.9±44.9 μgC/m3 and 58.3±46.7 μgC/m3 at the industrial site. The concentration of OC and EC during the winter monsoon found higher (1.3 times and 1.2 times in case of OC and EC respectively) as compared to the summer monsoon season. The high concentrations of OC and EC show the relatively stable atmospheric conditions lowering in mixing height due to relatively low atmospheric temperature. The study also observed the different fractions of OC and EC and found the average PM10 bound OC fractions were observed in the order of OC3>OC2>OC4, whereas the order for EC fractions was EC1>EC2>EC3. The surface morphology of the particles was analyzed by scanning electron microscopy (SEM). The results indicated collected samples were predominantly rich in fly ash particles and their aggregates, round/oval aluminosilicate particles, rich in Al, Si and O species during both the seasons.
- Publication:
-
43rd COSPAR Scientific Assembly. Held 28 January - 4 February
- Pub Date:
- January 2021
- Bibcode:
- 2021cosp...43E..35S