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How can EPAs diesel engine retrofit program contribute to mobile source emissions reductions?

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How can EPAs diesel engine retrofit program contribute to mobile source emissions reductions?

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Background: Recent estimates indicate that diesel exhaust from heavy-duty vehicles contributes 63 percent of the Nation’s on-road particulate matter (PM) inventory. These same diesels generate about 42 percent of on-road nitrogen oxides (NOx), or 13 percent of total NOx. Even more critical, heavy-duty vehicles off the highways, like construction or farm equipment, are estimated to generate 22 percent of the Nation’s NOx inventory-a total that also includes point and area sources. EPA reports that diesel engines are among the largest sources of PM, other than natural sources such as wildfires. Truck emissions are a necessary element of the transportation demand forecasting and emissions analysis conducted by the Nation’s major metropolitan areas. Controlling and reducing the emissions of these vehicles in metropolitan air quality nonattainment areas has been one of the more formidable clean air challenges since implementation of the 1990 amendments of the Clean Air Act. The transportati

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