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Due to a lapse in appropriations, EPA websites will not be regularly updated. In the event of an environmental emergency imminently threatening the safety of human life or where necessary to protect certain property, the EPA website will be updated with appropriate information. Please note that all information on the EPA website may not be up to date, and transactions and inquiries submitted to the EPA website may not be processed or responded to until appropriations are enacted.

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Diesel Fuel Standards

EPA’s decades-long effort to reduce criteria pollutants, air toxics and other harmful emissions from diesel fuel used in transportation have resulted in significant health and environmental benefits  while advancing technology, and minimizing cost.  These benefits are a result of a number of regulatory programs, including reducing sulfur levels in diesel fuel voluntary programs including the National Clean Diesel Campaign.