The goal of this program was to expand the database of particulate emissions measurements from motor vehicles to include larger numbers of representative in-use vehicles. For this work, FTP particulate mass emission rates were determined for gasoline and diesel vehicles, along with the fractions of particulates below 2.5 and 10 microns aerodynamic diameter. Chemical characterization of exhaust particulate was performed for a subset of gasoline and diesel vehicles including the determination of organic and elemental carbon fractions, analysis for trace elements and ions, and speciation of polynuclear aromatic hydrocarbons (PAHs), hopanes, and steranes. A total of 129 gasoline-fuel vehicles and 19 diesel-fueled vehicles were tested as part of the program. The results show that the average particulate emission rates for newer gasoline vehicles (1991-1997) are low with a fairly steady trend of increased emissions with increasing vehicle age. The average emission rates for the diesel-fueled vehicles are approximately one to two orders of magnitude higher than the gasoline vehicles.


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