Final Rule for Control of Emissions of Air Pollution From Highway Heavy-Duty Engines

On this page:

• Rule Summary
• Rule History
• Additional Resources

Rule Summary

The Environmental Protection Agency (EPA) is adopting a new combined emission standard for oxides of nitrogen (NO_x) and hydrocarbons (HC) for model year 2004 and later heavy-duty diesel engines used in trucks and buses. The new standard represents a 50 percent reduction in NO_x from the 1998 and later model year NO_x standard.

• Final Rule: Final Rule: Control of Emissions of Air Pollution From Highway Heavy-Duty Engines (pdf) (431 KB, published October 21, 1997)
• Final Regulatory Impact Analysis (pdf) (3.0 MB, EPA-420-R-97-011, September 1997)
• Summary and Analysis of Comments: Control of Emissions of Air Pollution from Highway Heavy-Duty Engines (pdf) (7.8 MB, September 1997, EPA-420-R-97-102)

Rule History

Proposed Rule and Related Materials

• Proposed Rule (pdf) (358 KB, published August 31, 1995)

Additional Resources

Technical Support Document

• Estimated Economic Impact of New Emission Standards for Heavy-Duty On-Highway Engines (pdf) (422 KB, EPA420-R-97-009, March 1997)

Fact Sheet

• New Emission Standards For Heavy-Duty Diesel Engines Used In Trucks And Buses (pdf) (21.5 KB, EPA-420-F-97-016, October 1997)