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Describes a vehicle that meets either EPA's CFV ULEV standards or CARB's California Low-Emission Vehicle Program ULEV standards. ULEVs produce fewer emissions than LEVs. Fleets that purchase CFV ULEVs may earn credits under the Clean-Fuel Fleet Vehicle Program. Manufacturers that sell CFV ULEVs may earn credits under the federal California Pilot Program.

A diesel fuel with 15 parts per million (ppm) or lower sulfur content. This ultra-low sulfur content enables use of advanced emission control technologies on light-duty and heavy-duty diesel vehicles. Most highway diesel fuel refined in or imported into the United States is required to be ULSD. One hundred percent must be ULSD nationwide by 2010.

A government agency, established in 1970, responsible for protecting the environment and public health. EPA seeks to reduce air, water, and land pollution and pollution from solid waste, radiation, pesticides, and toxic substances. EPA also controls emissions from motor vehicles, fuels, and fuel additives.

A department of the federal government, established by the Carter Administration in 1977, to consolidate energy-oriented programs and agencies. The DOE mission includes the coordination and management of energy conservation, supply, information dissemination, regulation, research, development and demonstration.

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