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Engine Categories
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Nonroad engines are used in an extremely wide range of applications, each involving great differences in operating characteristics, engine technology, and market dynamics. EPA has adopted emission standards for nearly all types of nonroad engines, equipment, and vehicles. These standards apply for each of the categories shown below. Separate requirements apply for gasoline and diesel fuel that these engines use.
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.
Publications
- Diesel Exhaust in the United States (PDF) - Fact sheet with an overview of diesel exhaust health and environmental effects. (412K, EPA420-F-03-022, June 2003)
- Fact Sheet: Plain Language Format of Emission Regulations (Also available as a PDF file (6 pp, 191K, EPA420-F-07-037, June 2007)
- Reducing Air Pollution From Nonroad Engines (PDF) (151K, EPA420-F-03-011, April 2003)
- How to Maintain or Rebuild Engines Certified to EPA Standards (PDF) (407K, EPA420-F-02-035, September 2002)
- Overview of EPA's Emission Standards for Marine Engines (PDF) (184K, EPA420-F-04-031, August 2004)
- 2008 Progress Report: Vehicle and Engine Compliance Activities (PDF) (49 pp, 3.9MB, EPA-420-R-10-022, August 2010, About PDF)
- 2007 Progress Report: Vehicle and Engine Compliance Activities (PDF) (64 pp, 890K, EPA420-R-08-011, October 2008)
- Emission Standards Reference Guide for Heavy-Duty and Nonroad Engines (PDF) (145K EPA420-F-97-014, September 1997)
- This document provides a detailed listing of existing and proposed Federal and California standards for model years 1990 and later.
Nonroad Engine and Vehicle Emission Study Report (EPA-21A-2001 or EPA460/3-91-02, November 1991).
This "nonroad study" quantifies the contribution of nonroad sources to air pollution, including volatile organic compounds (VOCs), oxides of nitrogen (NOx), carbon monoxide (CO), and particulate matter (PM). This study covers 10 equipment categories, including: lawn and garden equipment, farm and construction equipment, recreational vehicles, marine vessels, and airport service equipment.- Body of report (PDF) (1.8MB)
- Appendices (PDF) (7.7MB)