Research Projects

Project at a Glance

Project Status: complete

Title: Quantification of evaporative running loss emissions from gasoline-powered passenger cars in California

Principal Investigator / Author(s): McClement, Dennis

Contractor: Automotive Testing Laboratories, Inc.

Contract Number: A832-153

Research Program Area: Emissions Monitoring & Control

Topic Areas: Mobile Sources & Fuels


The purpose of this effort was to collect Running Loss Emission Data on a representative cross section of in-use, light duty passenger cars to support the development of California specific emission factors. Forty randomly procured vehicles were tested. A total of 104 sequences were performed. Tests were performed using fuels at 7.5 and 9.0 psi RVP, 105 and 95įF, and the LA-4 and NYCC driving sequences. The study found that the evaporative running loss emissions were strongly dependent on the age of the vehicles, fuel vapor pressure and ambient temperatures. Substantial differences in running loss emissions were found between these factors. Vehicles were less sensitive to driving cycle when considered on a mass per unit time basis.


For questions regarding this research project, including available data and progress status, contact: Heather Choi at (916) 322-3893

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