19,214,000 tons of VOC, 23,582,000 tons of NOx, and 87,451,000 tons of CO emissions in 1997 in the United States by source category. Emissions from on-road vehicles are included in the transportation source category.
Source: EPA 1998.
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Ozone-Forming Potential of Reformulated Gasoline . Washington, DC: The National Academies Press,
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