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Particulate matter is one of the major pollutant responsible for deteriorating air quality, particularly in urban centers. Information on contributing sources with the share from different sources is a first and one of the important steps in controlling pollution. Diverse sources, anthropogenic as well as natural, like industries, transport, domestic burning, construction, wind-blown dust, road dust contribute to particulate matter pollution. Receptor modeling is a scientific method which is utilized for assessment of the contribution of various sources based on chemical characteristics of particulate matter sources and ambient air particulate matter. Representative data of fractions of various chemical species in the particulate matter from the different sources i.e. source fingerprint is an essential input for the receptor modeling approach.

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.

Used oil analysis plays an important role in the field of engine development, considering that it can give brief idea about performance of lubricant/ oil being used, its compatibility with the system under considerations. At present, regular testing is done like elemental analysis using Inductive Coupled Plasma (ICP) which can give idea about wear elements and additive elements. But it does not give information on morphological characterization of particles. In present work, Environmental Scanning Electron Microscopy technique with EDAX detector is used for characterizing the used oil. Oil is filtered on suitable paper and the particles collected on paper are analyzed. This gives the information on morphology and size of particles, their elemental analysis and mapping so that the sources can be judged. Size of wear metal particle is very important factor as even few bigger size particles are more detrimental than large number of smaller particles.