Research Projects

Project at a Glance

Project Status: complete

Report Published March 1978:

Title: Heavy-duty vehicle emission inventory system.

Principal Investigator / Author(s): Arledge, Kenneth W

Contractor: TRW Environmental

Contract Number: A6-051-87

Research Program Area: Emissions Monitoring & Control

Topic Areas: Mobile Sources & Fuels, Modeling


A computerized mobile source emissions model for light-, medium-, and heavy-duty vehicles was developed. The emissions model, which is based on a detailed traffic model, was applied to medium- and heavy-duty vehicles in California's South Coast Air Basin (the Los Angeles Area). Two (2) 1975 inventories were generated, one using emission factors developed by the California Air Resources Board and the other using the emission factors recommended by the United States Environmental Protection Agency for California vehicles. In both cases the predicted emissions exceeded the values developed by the California Air Resources Board for all pollutants. The major reason for the difference is the lower estimate of vehicle miles traveled used by the Air Resources Board. This report was submitted in fulfillment of Contract Number A6-051-87 by TRW Environmental Engineering Division under sponsorship of the California Air Resources Board. Work was completed as of March 10, 1978.


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

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