High seasonal variation of atmospheric C and particle concentrations in Delhi, India (original) (raw)

Abstract

The highly populated Indian regions are currently in a phase of rapid economic growth resulting in high emissions of carbonaceous aerosols. This leads to poor air quality and impact on climate. The chemical composition of carbonaceous aerosols has rarely been studied in industrial areas of India. Here, we investigated carbonaceous aerosols in particulate matter (PM) on monthly basis in the industrial area of Delhi in 2011. The concentrations of organic C and elemental C in PM10 were analyzed. Results show a clear seasonal variability of organic and elemental C. PM10 ranged 95.9–453.5 μg m−3, organic C ranged 28.8– 159.4 μg m−3, and elemental C ranged 7.5–44.0 μg m−3; those values were higher than the reported values. Organic and elemental C were correlated with each other in pre-monsoon and winter seasons, implying the existence of similar emission sources such as coal combustion, biomass burning and vehicular exhaust. The annual average contribution of total carbonaceous aerosols in PM10 was estimated as 62 %.

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