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This study focused on the small size nano-particulates that pose the greatest risk to human health for which significant uncertainties remain. Diesel engine powered vehicles are generally considered to be primary contributors of particulate matter and consequent health hazards as compared to particulates emitted by gasoline and gas driven vehicles. This paper discusses the findings of particulate emissions with respect to number and size distribution with variables like lubrication system, different fuels on 2-wheelers and 3-wheeler auto rickshaw using electrically low pressure impactor (ELPI). Analysis of particulates with CVS system and direct tail pipe were also done for highlighting the ambiguity in both the measurements. Particle number concentration was found more in the two-stroke engine powered two wheelers.