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Regulations and Standards

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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.

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.

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.

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2007 Technical Amendments (published May 18, 2007)

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Final Emission Standards for Stationary Compression-Ignition Engines (published July 11, 2006)

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Amended Regulations for Diesel Fuels  

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Final 2005 Technical Amendments
Procedures for Testing Highway and Nonroad Engines and Omnibus Technical Amendments (published July 13, 2005)

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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.

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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.

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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.

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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.

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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.

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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.

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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.

 

For more information, contact the ASD Information Line at asdinfo@epa.gov or 734-214-4636.

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