Research Projects

Project at a Glance

Title: Reducing air pollution exposure in passenger vehicles and school buses

Principal Investigator / Author(s): Zhu, Yifang

Contractor: UC Los Angeles

Contract Number: 11-310

Research Program Area: Health & Exposure

Topic Areas: Indoor Air Quality, Mobile Sources & Fuels

Research Summary:

Exposure to roadway-related particulate matter (PM) has been linked to respiratory and cardiovascular diseases. A significant percentage of the daily exposure to this pollution has been demonstrated to occur while commuting between home and work or school. While substantial progress has been made in reducing on-road emissions by tightening vehicle emission standards and retrofitting trucks and buses, exposure to commuters is still of concern due to their proximity to the sources of this pollution. The investigators will assess the effectiveness of high efficiency (HEPA) filters in cars and school buses to mitigate roadway exposures of commuters. In-cabin particulate levels will be tested in 12 cars driven under three in-cabin filter schemes, including: 1) no passenger-cabin filters, 2) passenger-cabin filters provided by the manufacturer, and 3) HEPA passenger-cabin filters. In-cabin particulate levels in buses will be tested with and without in-cabin HEPA filters. Results from these studies will provide the Air Resources Board (ARB) with a detailed understanding of the extent to which passenger cabin filters can mitigate exposures to roadway pollution at a relatively low cost.


For questions regarding research reports, contact: Heather Choi at (916) 322-3893

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