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Particulate emissions data are presented from a group of 19 in-use diesel automobiles. Five driving cycles and three fuel/lubricating oil combinations have been used to obtain particulate emissions data and also to collect particulate samples for chemical and bioassay characterization studies. Particulate samples were solvent extracted with dichloromethane to obtain the soluble organic fraction (SOF) of the emitted particulate. Particulate and SOF data are presented for emission/distance, emission/time and emission/fuel consumed basis by vehicle manufacture, driving cycle, and fuel/oil subcategory. Some SOF samples have been used in the bioassay test of Ames, and these results are presented for different vehicles and driving cycles. Particulate emissions, SOF emissions and bioassay activity results are presented in terms of mileage accumulation effects.

A sample of 20 in-use light-duty diesel vehicles were extensively and repeatedly tested for two years. Gaseous and particulate emissions were measured for the FTP, HFET, CFDS, NYCC, 50 mph cruise, and idle driving cycles. Vehicles were tested with both as-received and control fuel and lubricating oil. Particulate extracts were obtained by Soxhlet extraction with dichloromethane, and the extracts assayed for mutagenic activity by the Ames Salmonella typhimurium/microsome method with TA98(-) tester strain. Particulate, extract, residue, hydrocarbons, carbon monoxide, nitrogen oxides, % extractible, fuel economy and Ames activity are discussed as they relate to driving cycles and mileage accumulation. Driving cycles were found to affect emissions more strongly and consistently than does mileage accumulation. Cycle and mileage effects were observed in some cases for Ames activity but were not well defined.