The U.S. Environmental Protection Agency (EPA) web site has information covering all aspects of the Clean Diesel and S15 (ULSD) program.
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Highway Diesel Fuel Sulfur Control Requirements
The EPA fact sheet contains a basic description of the S15 (ULSD) program.
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EPA Regulatory Announcement
The Clean Diesel Fuel Alliance is a group of public and private organizations that came together to help facilitate the introduction of S15 (ULSD).
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Clean Diesel Fuel Website