Measurement of Primary Particulate Matter Emissions from Light-Duty Motor211 Vehicles

摘要

The goal of this program was to expand the database of particulate emissions211u001emeasurements from motor vehicles to include larger numbers of representative in-211u001euse vehicles. For this work, FTP particulate mass emission rates were determined 211u001efor gasoline and diesel vehicles, along with the fractions of particulates below 211u001e2.5 and 10 microns aerodynamic diameter. Chemical characterization of exhaust 211u001eparticulate was performed for a subset of gasoline and diesel vehicles including 211u001ethe determination of organic and elemental carbon fractions, analysis for trace 211u001eelements and ions, and speciation of polynuclear aromatic hydrocarbons (PAHs), 211u001ehopanes, and steranes. A total of 129 gasoline-fueld vehicles and 19 diesel-211u001efueled vehicles were tested as part of the program. The results show that the 211u001eaverage particulate emission rates for newer gasoline vehicles (1991-1997) are 211u001elow with a fairly steady trend of increased emissions with increasing vehicle 211u001eage. The average emission rates for the diesel-fueled vehicles are approximately 211u001eone to two orders of magnitude higher than the gasoline vehicles.