Ambient fine particulate matter (PM2.5) levels in Delhi, India rank among the highest levels routinely measured in any city in the world. Annual average PM2.5 concentrations in Delhi are roughly ~150 µg m-3, or about 15 times higher than WHO guideline concentrations, and respectively 8 and 1.5 times higher than levels in Los Angeles and Beijing. High PM2.5 levels in Delhi are driven by a combination of unfavorable local meteorology and an unusually diverse mixture of local sources. PM sources in the Delhi area include light- and heavy-duty vehicle traffic emissions and associated road dust, solid fuel combustion for heating and cooking, waste burning, thermal power plants, diesel generators, construction, and small-scale local industries (e.g., brick manufacturing).
Our research group conducts field and modeling studies to characterize sources and levels of pollution in India. Current projects include: (i) characterizing wintertime pollution episodes in Delhi and (ii) performance evaluation of lower-cost PM monitoring techniques.
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