Project at a Glance

Title: Methods development for assessment of vapor-phase mutagens and carcinogens in ambient air

Principal Investigator / Author(s): Hsieh, Dennis P H

Contractor: University of California, Davis

Contract Number: A6-174-32

Research Program Area: Atmospheric Processes

Topic Areas: Chemistry & Reactivity


Objectives: To develop methods of identifying potentially toxic and mutagenic compounds in the gaseous (vapor) phase of ambient air.

Findings: The feasibility of a new system to chemically characterize a complex volatile mixture was demonstrated and applied to diesel bus exhaust. Results indicated that mutagenic activity in vapor-phase exhaust gases was greater than that in particulate phase exhaust.

Importance to ARB's Program: The Health and Safety Code requires the ARB to identify toxic air contaminants. The methods developed in this project will help the ARB determine which vapor-phase compounds are the most important candidate toxic air contaminants.

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

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