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Gasoline/Diesel PM Split Study: Light-Duty Vehicle Testing, Data, and Analysis

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Abstract: During June 2001, the EPA participated in DOE's Gasoline/Diesel PM Split Study in Riverside, California. The purpose of the study was to determine the contribution of diesel versus gasoline-powered exhaust to the particulate matter (PM) inventory in the South Coast Air Basin. The EPA participation, which was performed under contract with CAVTC, involved recruiting (with the assistance from the California Bureau of Automotive Repair), conducting dynamometer tests, and measuring PM2.5, regulated, and gaseous air toxic emissions from 59 light-duty motor vehicles.

This presentation describes emission rates obtained for PM2.5, regulated pollutants, and gaseous air toxic compounds that were measured from the gasoline-powered test cars. Emission rates from the test vehicles are presented in context to the category in which they were recruited. Vehicles were recruited into eleven different categories based upon their age and mileage, except that one category consisted entirely of "smokers" and one of light-duty diesels. In general, emissions from the older, high mileage cars contributed the bulk of pollutant emissions from the test fleet. None of the gasoline-powered vehicles tested had a PM2.5 emission rate exceeding 200 mg/mile for the weighted, cold-start LA-92 test that was run. Therefore, it appeared that no grossly high PM emitters were recruited into this study. Comparison of emission rates derived from dilution tunnel sampling versus those from sampling in a residence chamber is made.

This is an abstract of a proposed presentation and does not necessarily reflect the United States Environmental Protection Agency (EPA) policy. The actual presentation has not been peer reviewed by EPA. Mention of trade names or commercial products does not constitute endorsement or recommendation for use.

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Citation:Gabele, P. A. Gasoline/Diesel PM Split Study: Light-Duty Vehicle Testing, Data, and Analysis. Presented at Thirteenth CRC On-Road Vehicle Emissions Workshop, San Diego, CA, April 7-9, 2003.
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Contact: Liz Hope - (919) 541-2785 or hope.elizabeth@epa.gov
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Division: Human Exposure & Atmospheric Sciences Division
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Branch: Environmental Characterization & Apportionment Branch
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Product Type: Abstrct/Oral
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Presented: 04/07/2003
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Related Entries:
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Bullet Item Chemical Characterization & Speciation of Mobile Source Emissions: Human Exposure Implications & Implementation Perspectives
spacer Relationship Reason:   A Project of the Product
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Last Updated on Monday, October 22, 2007
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