10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Contrasting Temporal and Spatial Variation of Atmospheric Carbonaceous Aerosols during a Year-Long Measurement in Central India
SHAMSH PERVEZ, Rakesh Sahu, Suresh Tiwari, A.S. Panicker, Rajan K. Chakrabarty, Judith Chow, John Watson, Yasmeen F. Pervez, Pandit Ravishankar Shukla University, Chhattisgarh, India
Abstract Number: 533 Working Group: Carbonaceous Aerosol
Abstract Air pollution is now serious health concern in developing countries including India and has been responsible for adverse effects on human health. The study, presented here, describe the spatiotemporal variability in year-long measurements of ambient PM2.5 and associated component of carbonaceous matter in rural, industrial and urban environments of Central India during October 2015 to September 2016. Weekly PM2.5 aerosols sampling were carried out (gravimetrically) using a set of two parallel PM2.5 cut-off impactors consisted MiniVol air samplers, positioned in an urban, industrial and rural environments of Raipur, Bhilai and Kosmarra (a village of Dhamtari District), Chhattisgarh, India. Urban site was also used to measure day and night time ambient PM2.5 to evaluate the impact of meteorological parameters on occurrences of PM2.5 masses. PM2.5 deposited on quartz filters were analyzed for temperature resolved fractions of carbonaceous matter using Thermal/Optical carbon analyzer (DRI Model 2001) by following IMPROVE_A Protocol. The annual average PM2.5 mass concentrations of rural, urban and industrial sites found to be ~2 to 5 folds higher than the Indian National Ambient Air Quality Standard (NAAQS). Higher occurrences of OC and EC in PM2.5 was observed in the winter season, compared to those measured in the summer and post-rainy. Similarly, OC and EC concentrations were found to be higher at night time than those observed for daytime in the urban site. On comparing with reported values for other Indian locations, Raipur (urban) and Bhilai (urban-industrial) sites have shown the highest percentage of Total Carbonaceous Aerosols (TCA) in ambient PM2.5. The annual mean ratio of OC/EC has been found to be 3.50 ± 1.76 (range 2.16 to 7.84) and 3.94 ± 0.98 (range 1.63 to 5.42) in urban and rural sites, respectively; indicates the dominance of biomass burning (BB) and incomplete combustion (IC) in industrial processes in occurrence of higher carbonaceous aerosols in ambient air. The average char/soot ratios are observed to be 3.65 ± 2.65, 1.77 ± 0.98 and 1.93 ± 0.62 for urban, rural and industrial sites, respectively. Contribution of secondary organic aerosol (SOA) to ambient OC and thermal fractions of OC and EC have also been investigated for rural, industrial and urban sites and analysis is in progress. The details results will be presented during the conference.