Abstract
Mobile source air toxics (MSAT) may pose an adverse health risk, especially in microenvironments with high exposures to vehicle exhaust or evaporative emissions. Although programs such as reformulated gasoline are intended to reduce the emissions of MSAT and ozone precursors, uncertainties remain regarding population exposures associated with both oxygenate-gasoline blends and conventional gasoline. Measurements were carried out in San Antonio, Texas under controlled conditions to establish relationships between vehicle tailpipe and evaporative emissions and concentration levels in a residence with an attached garage. This paper concentrates on the influence of vehicle type (sedan versus pickup truck), its operational mode (normal versus malfunction), and fuel type (conventional versus oxygenated) on the pollutant levels in the attached garage and adjacent room (kitchen).
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