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Regulations and Standards
Below are the Heavy-Duty Highway Diesel regulations and standards. The links will either take you directly to the rulemaking document, if there's only one document, or the link will take you to a page that has the rulemaking document and all the associated documents for that rule.
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.
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Published August 30, 2006, Direct Final Rule and Concurrent Notice of Proposed Rulemaking Amending Regulations for Heavy-Duty Diesel Vehicles: Technical amendments to the regulations, correcting typographical errors, revising references, removing old provisions, and revising some provisions regarding deterioration factors.
- Fact Sheet: Highway Heavy-Duty Diesel Engine Regulatory Amendments (also available as a PDF file, 4 pp, 119K, EPA420-F-06-059, August 2006)
- Direct Final Rule (also available as a PDF file, 9 pp, 210K)
- Notice of Proposed Rule (also available as a PDF file, 4 pp, 118K)
- Highway Diesel Rule
Clean Diesel Trucks, Buses, and Fuel: Heavy-Duty Engine and Vehicle Standards and Highway Diesel Fuel Sulfur Control Requirements (the "2007 Heavy-Duty Highway Rule") (Final Rule published January 18, 2001; Proposed Rule published May 2000) - Regulations Related to Highway Diesel Fuel in Alaska & U.S. Territories
- Amendments to the Highway and Nonroad Diesel Rules-- Fuel-Related Technical Amendments
- Approval of New Scheduled Maintenance for Diesel Particulate Filters in Certain Applications (Final Rule published March 7, 2006)
- Testing Related Rulemakings and Technical Amendments
- In-Use Testing for Heavy-Duty Engines and Vehicles (Final Rule published June 14, 2005; Proposed Rule published June 10, 2004)
- Testing Highway and Nonroad Engines and Omnibus Technical Amendments (Final Procedures published July 13, 2005; Proposed Procedures published September 10, 2004)
- Settlement with the Engine Manufacturers Association to propose a manufacturer-run, in-use emissions testing program for heavy-duty diesel trucks and to provide for EPA engine certification guidance (June 2003)
- Amending the Test Procedures for Heavy-Duty Engines, and Light-Duty Vehicles and Trucks and the Amending of Emission Standard Provisions for Gaseous Fueled Vehicles and Engines Direct Final Rule (published September 5, 1997) and Notice of Proposed Rulemaking (published September 5, 1997)
- Heavy-Duty Engine Highway Test Procedure Clarifications (52K ZIP WordPerfect) (December 1995) (Free zip software is available at http://www.download.com)
- Rulemakings Regarding Nonconformance Penalties
- Nonconformance Penalties for 2004 and later Model Year Emission Standards for Heavy-Duty Diesel Engines and Heavy-Duty Diesel Vehicles (Final Rule published August 1, 2002; Proposed Rule published January 16, 2002)
- Nonconformance Penalties for 1996 Model Year Emission Standards for Heavy-Duty Vehicles Final Rule (published February 23, 1996) and Direct Final Rule (published February 23, 1996)
- Control of Emissions of Air Pollution from 2004 and Later Model Year Heavy-Duty Highway Engines and Vehicles (Final Rule published October 6, 2000; Proposed Rule published October 1999)
- Guidance Document to States
- New Emission Standards for Heavy-Duty Diesel Engines Use in Trucks and Buses (Final Rule published October 1997)
- Control of Air Pollution From Heavy-Duty Engines
- Reopening of Public Comment Period for Control of Air Pollution From Heavy-Duty Engines for Advanced Notice of Proposed Rulemaking (published October 1995)
- Control of Air Pollution From Heavy-Duty Engines (Advance Notice of Proposed Rulemaking published August 1995)
- Evaporative and Refueling Emission Regulations for Gasoline- and Methanol-Fueled Light-Duty Vehicles and Light-Duty Trucks and Heavy-Duty Vehicles; Technical Amendments (Final Rule published August 1995)
- Agency Completion of Study Regarding Heavy-Duty Engine Rebuilding Practices and Availability of Documents (Notice published August 1995)