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A diverse range of sources like, domestic, industries and vehicles contribute to the airborne particulate matter observed in the urban atmosphere. Impact of growing number of vehicles, with a compounded annual growth rate of 15%, on air quality is evident. The particles in gasoline and diesel vehicle exhaust carry distinctive combinations of certain chemical compounds. The prominence of their chemical signature in ambient particulate matter is thus a qualitative but direct indication of gasoline and diesel vehicles' relative importance as sources of emissions. The vehicle emission profiles generated, by PM characterization together with the ambient particulate matter speciation data, could be a realistic input to the source apportionment study for identification of sources of air pollution.

Airborne particulate matter (PM) in an urban atmosphere is a result of contribution from diverse range of source including domestic, industry and vehicles. PM emission is a matter a concern due to its multiple impacts on public health, air quality, and global climate. Ever increasing number of vehicles plying on the road is considered to be one of the major sources of PM. Particles in gasoline and diesel vehicle exhaust carry distinctive combinations of certain chemical compounds. Prominence of their chemical signature in ambient particulate matter can be considered as a direct indication of their relative importance as sources of emissions. In this study, Chemical speciation data of vehicle exhaust PM is analyzed and vehicle category wise distribution of carbon fractions is presented for different engine technologies and fuel types.