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Project at a Glance

Project Status: complete

Report Published January 1989:

Title: Characterization of exhaust emissions from trap-equipped light-duty diesels

Principal Investigator / Author(s): Smith, Lawrence R

Contract Number: A5-159-32

Research Program Area: Emissions Monitoring & Control

Topic Areas: Acid Deposition, Mobile Sources & Fuels


This program involved characterization and quantification of emissions from two different types of trap-equipped light-duty diesel vehicles. One vehicle was equipped with a catalyzed trap system and the other with an additive-regenerated trap system. The vehicles were tested using a chassis dynamometer, a dilution tunnel, and a constant volume sampler. Exhaust emissions were evaluated as to driving cycle, presence of trap, engine condition, trap condition, and fuel aromatic content. Emissions evaluated included the regulated exhaust emissions (total hydrocarbons, carbon monoxide, oxides of nitrogen, and particulate) and a number of unregulated emissions including: aldehydes and ketones, sulfate, metals and other trace elements, volatile organics, semivolatile organics, and 1,3-butadiene. Additional evaluations included the determination of the particulate soluble organic fraction, fuel economy by the carbon balance method, and the collection of particulate for mutagenesis testing in another program.


For questions regarding this research project, including available data and progress status, contact: Research Division staff at (916) 445-0753

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