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Motor Vehicle-Related Air Toxics Study

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This study was required under Section 202(1)(1) of the Clean Air Act. The study was of the need for, and feasibility of, controlling emissions of toxic air pollutants which are unregulated under the Act and associated with motor vehicles and motor vehicle fuels. The study focused on those categories of emissions that pose the greatest risk to human health or about which significant uncertainties remain, including emissions of benzene, formaldehyde, and 1,3-butadiene. This study attempted to summarize what was known about all motor vehicle-related air toxics. The focus of the study was on carcinogenic risk, although noncarcinogenic risk was discussed in a less quantitative way.

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