Regulations and Standards
Related Topics
This page has emission regulations and related documents that apply to nonroad diesel engines used in land-based applications such as construction, agricultural, and industrial equipment. See marine vessels and locomotives for other diesel engine regulations.
- Authorization Request from California Air Resources Board for Nonroad Diesel In-use Fleet Requirements
- Nonroad Diesel Technical Amendments and Tier 3 Technical Relief Provision
- 2007 Technical Amendments
- Emission Standards for Stationary Engines
- Amended Regulations for Diesel Fuel
- 2005 Technical Amendments
- Tier 4 Emission Standards
- Agricultural Pump and Irrigation Rule
- 2002 Technical Amendments
- Tier 2 and Tier 3 Emission Standards
- 1996 Technical Amendments
- Tier 1 Emission Standards
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.
Authorization Request from California Air Resources Board for Nonroad Diesel In-use Fleet Requirements
EPA previously announced the opportunity for public hearing and written comment on the California Air Resources Board’s request for an authorization of its regulations for fleets that operate nonroad, diesel fueled equipment with engines 25 horsepower (hp) and greater and that require such fleets to meet fleet average emissions standards for oxides of nitrogen and particulate matter, or, alternatively, to comply with best available control technology requirements for the vehicles in those fleets. The previous announcement occurred on October 7, 2008, at 73 FR 58585. EPA is announcing an extension of the written comment period from November 28, 2008 to December 19, 2008.
- Notice of Extension of Written Comment Period | PDF Version (1 pp, 65K, published November 14, 2008)
- Original Authorization Request Notice | PDF Version (3 pp; 60K; October 7, 2008)
Nonroad Diesel Technical Amendments and Tier 3 Technical Relief Provision
EPA received adverse comments regarding the direct final rule. We are therefore making a partial withdrawal and revision of 40 CFR 89.102 paragraphs (i) through (m). The revision involves renumbering of the paragraphs to make clear that the notification, reporting, recordkeeping and equipment labeling requirements apply exclusively to the engines utilizing this technical relief provision.
In a memo to the docket, we addressed comments that required no change to the regulation. The comments and memo are in the docket at www.regulations.gov. (NOTE: To access the docket, select Advanced Search, then Docket Search, and type EPA-HQ-OAR-2007-0652 as the Docket ID.)
Additional technical amendments included in this EPA regulation had no changes and went into effect with the direct final rule.
- Partial Removal of Direct Final Rule and Revision of the Nonroad Diesel Technical Amendments and Tier 3 Technical Relief Provision | PDF Version (4 pp, 116K, published December 26, 2007)
- Fact Sheet | PDF Version (3 pp, 103K, EPA420-F-07-055, September 2007)
- Proposed Rule | PDF Version (8 pp, 173K, published September 18, 2007)
- Direct Final Rule | PDF Version (17 pp, 318K, published September 18, 2007)
2007 Technical Amendments (published May 18, 2007)
- Regulation (entire document PDF) (297 pp, 4MB) or:
- Pages 28097-28146 | PDF Version (372K)
- Pages 28147-28196 | PDF Version (469K)
- Pages 28197-28246 | PDF Version (799K)
- Pages 28247-28296 | PDF Version (882K)
- Pages 28297-28346 | PDF Version (874K)
- Pages 28347-28393 | PDF Version (871K)
- Redline version highlighting proposed changes for 40 CFR parts 1065 (PDF) (83 pp, 1.3MB) and 1068 (PDF) (48 pp, 628K)
Final Emission Standards for Stationary Compression-Ignition Engines (published July 11, 2006)
- Fact Sheet
- Federal Register Notice | PDF Version (33 pp, 254K)
Amended Regulations for Diesel Fuels
- Final Rule: Revisions to Motor Vehicle Diesel Fuel Sulfur Transition Provisions, and Technical Amendments to the Highway Diesel, Nonroad Diesel, and Tier 2 Gasoline Programs (published November 22, 2005)
- Final Rule: To Establish a Transition Program for Low-Sulfur Diesel in Alaska (published June 6, 2006)
- Final Rule: To Amend the Nonroad Diesel and Highway Diesel Fuel Regulations (published July 15, 2005)
Final 2005 Technical Amendments
Procedures for Testing Highway and Nonroad Engines and Omnibus Technical Amendments (published July 13, 2005)
- Fact Sheet | PDF Version (4 pp, 134K, EPA420-F-05-036, July 2005)
- Federal Register Notice: Entire Document | PDF Version (194 pp, 7.4MB)
- Preamble and 40 CFR Parts 85-94 (PDF), pages 40419-40462 (43 pp, 762K)
- 40 CFR Parts 1039, 1048, 1051, and 1068 (PDF), pages 40462-40516 (55 pp, 986K)
- 40 CFR Part 1065 (PDF), pages 40516-40612 (97 pp, 8.6MB)
- Technical Support Document and Summary & Analysis of Comments (PDF) (115 pp, 1.7MB, EPA420-R-05-008, June 2005)
- See Proposed Technical Amendments for the proposed rule, fact sheet, and technical support documents (published September 10, 2004)
Clean Air Nonroad Diesel Final Rule -- Tier 4
EPA adopted a comprehensive national program to greatly reduce emissions from future nonroad diesel engines by integrating engine and fuel controls as a system to gain the greatest air-quality benefits. This historic rule, published June 29, 2004, will dramatically transform nonroad diesel engines and the fuel they use. The emission standards will reduce emissions of particulate matter and nitrogen oxides from nonroad diesel engines by more than 90 percent. The requirement to reduce sulfur levels in nonroad diesel fuel by more than 99 percent will allow for the first time advanced emission-control systems to be used on the engines used in construction, agricultural, industrial, and airport service equipment.
Agricultural Pump and Irrigation Rule: Withdrawal of Direct Final Rulemaking -- Control of Emissions from New Nonroad Diesel Engines: Amendments to the Nonroad Engine Definition
Withdrawal of amendments that were included in the direct final rule published April 11, 2003 (68 FR 17741), amending the definition of nonroad engines to also include all engines certified as part of a nonroad engine family if used in agricultural applications in the state of California. This amendment is being withdrawn due to receipt of adverse comments; therefore, the existing definition regarding nonroad engines remains in effect.
- Federal Register Notice | PDF Version (2 pp, 40K, published May 14, 2003)
- Direct Final Rule (published before withdrawal)
2002 Technical Amendments to 40 CFR Part 89
Minor changes to the definitions and prohibited controls sections of 40 CFR Part 89 for nonroad compression-ignition engines to coordinate with regulatory provisions for spark-ignition engines. These changes were published as part of a final rulemaking for large, industrial spark-ignition engines, recreational marine diesel engines, and recreational vehicles.
- Federal Register Notice | PDF Version (207 pp, 1.1MB, published November 8, 2002)
- Other related documents regarding the final rule are available at www.epa.gov/nonroad/2002/clean-rec.htm.
Tier 2 and Tier 3 Emission Standards -- Final Rule
Finalization of more stringent emission standards for nitrogen oxides, hydrocarbons, and particulate matter from new nonroad diesel engines. This program includes the first set of standards for nonroad diesel engines less than 37 kW (phasing in between 1999 and 2000), including marine engines in this size range. It also phases in more stringent "Tier 2" emission standards from 2001 to 2006 for all engine sizes and adds yet more stringent "Tier 3" standards for engines between 37 and 560 kW (50 and 750 hp) from 2006 to 2008.
- Fact Sheet (PDF) (3 pp, 13K, EPA420-F-98-034, August 1998)
- Federal Register Notice | PDF Version (57 pp, 563K, published October 23, 1998)
- Final Regulatory Impact Analysis (PDF) (137 pp, 651K, EPA420-R-98-016, August 1998)
- Summary and Analysis of Comments (PDF) (117 pp, 343K, August 1998)
- Questions and Answers | PDF Version (3 pp, 14K)
- See Proposed Emission Standards for the proposed rule, fact sheets, and regulatory support documents.
1996 Amendments: Provisions for Replacement Compression-Ignition Engines and the Use of On-Highway Compression-Ignition Engines in Nonroad Vehicles -- Final Rule
Amendments to the regulations applicable to compression-ignition nonroad engines at or above 37 kW to allow nonroad vehicle manufacturers to use certified on-highway engines in nonroad vehicles that are constructed from on-highway vehicles or that must use public roads between job sites. These amendments also will allow engine manufacturers to provide uncertified replacement engines to repower pre-regulation nonroad equipment when that equipment experiences major engine failure.
- Direct Final Rule: Federal Register Notice | PDF Version (7 pp, 48K, published November 12, 1996)
Determination of Significance for Nonroad Sources and Emission Standards for New Nonroad Compression-Ignition Engines At or Above 37 Kilowatts
This final rule determined that emissions from nonroad engines are significant contributors to ozone and carbon monoxide (CO) nonattainment, and finalized standards for CO, hydrocarbons, particulate matter, nitrogen oxides, and smoke emissions from nonroad compression-ignition engines at or above 37 kW.
- Federal Register Notice (published June 17, 1994)
- Regulatory Impact Analysis and Regulatory Support Document (PDF) (160 pp, 566K, May 1994)
Nonroad Engine and Vehicle Emission Study Report
This "nonroad study" quantifies the contribution of nonroad sources to air pollution, including volatile organic compounds, nitrogen, carbon monoxide, and particulate matter. The 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) (141 pp, 1.8MB, EPA-21A-2001 or EPA460/3-91-002, November 1991)
- Appendices (PDF) (415 pp, 7.7MB)
For more information, contact the ASD Information Line at asdinfo@epa.gov or 734-214-4636.