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Tier 2 Vehicle and Gasoline Sulfur Program
The Tier 2 Vehicle and Gasoline Sulfur Program affects every new passenger vehicle and every gallon of gasoline sold in the U.S. By designing cleaner cars that run on cleaner fuels the result is cleaner air. The program is a series of "firsts." For the first time:
The Tier 2 Vehicle and Gasoline Sulfur program is part of a series of major initiatives that will reduce emissions from passenger vehicles, highway trucks and buses, and nonroad diesel equipment. The result will be reduced emissions, cleaner air, and improved human health.
NOTE: You will need Adobe Acrobat Reader, available as a free download, to view some of the files on this page. See EPA's PDF page to learn more about PDF, and for a link to the free Acrobat Reader.
Regulations & Standards
- Final Rule (PDF) (173 pp, 1.14MB, published February 10, 2000)
- Regulatory Impact Analysis (PDF) (522 pp, 2MB, EPA 420-R-99-023, December 1999)
- Response to Comments - Tier 2 Motor Vehicle Emission Standards and Gasoline Sulfur Control Requirements (PDF) (525 pp, 2.2MB, EPA420-R99-024, December 1999)
Guidance Documents
- February 2005 Gasoline Sulfur Rule Questions and Answers (PDF) (13 pp, 40K, EPA420-F-05-001, February 2005)
- December 2000 Gasoline Sulfur Rule Questions and Answers (PDF) (24K, EPA420-F-00-056, December 2000)
- May 2000 Gasoline Sulfur Rule Questions and Answers (PDF) (92K, EPA420-F-00-018, May 2000)