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Tier 2 Vehicle and Gasoline Sulfur Program

The Tier 2 Vehicle and Gasoline Sulfur Program requires new passenger vehicles, including sport utility vehicles, pick-up trucks, and vans, to meet stringent emissions standards. New emission standards apply to all light vehicles, regardless of whether they run on gasoline, diesel, or alternative fuels. Additionally, this program requires gasoline refiners and importers to reduce the sulfur content of gasoline sold in the United States. (Reference 42 U.S. Code 7521)