| Title: | School Bus Study; Measurement of Selected Diesel-Associated Air Pollutants in School Bus Cabins Prior to and Following the Installation of Retrofit Technologies |
| Project Period: | 05/01/2006 - 10/01/2006 |
| Total Budget: | $75,000 |
| Sub-Contractors: | University of Texas Austin
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Previous studies have suggested that exposure to diesel exhaust is enhanced by school bus commutes and proximity to roadways. Other variables that are thought to influence exposure include window position, route, length of commute, bus age, meteorological conditions, and the presence or absence of emission control technology. This project will measure and analyze in-cabin levels of diesel-related pollutants under school bus operating conditions prior to and following the installation of selected emissions control devices. Measurements will be taken of in-cabin and ambient air quality school buses operating over typical bus route conditions (with no children on-board). Proposed testing includes five buses with four to be equipped with emission reduction technologies, a diesel oxidation catalyst (DOC) device and a closed crankcase filtration device (referred to as a Spiracle) used with ultra-low sulfur diesel (ULSD). Measurements will be taken prior to and following installation of these retrofit technologies.
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