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Nonroad Engines, Equipment, and Vehicles

Previously Proposed Emission Standards

This page includes a collection of previously proposed emission standards for nonroad engines. For currently effective regulations, see our Emission Standards Reference Guide or see regulations by engine category.

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.

Proposed Rule: Control of Emissions from New Marine Compression-Ignition Engines at or Above 30 Liters per Cylinder (published August 28, 2009)
Proposed Emission Standards (published May 18, 2007)
Advance Notice of Proposed Rulemaking (ANPRM): Control of Emissions from New Marine Compression-Ignition Engines at or Above 30 Liters per Cylinder (published December 7, 2007)
Change in Regulatory Deadline for Rulemaking to address the Control of Emissions from New Marine Compression-Ignition Engines at or Above 30 Liters per Cylinder (Final December 5, 2007, Proposed April 27, 2007)
Proposed Rule: Control of Emissions of Air Pollution from Locomotives and Marine Compression-Ignition Engines Less than 30 Liters per Cylinder (published April 3, 2007)
Advance Notice of Proposed Rulemaking (ANPRM): Reducing Emissions for Locomotive and Marine Diesel Engines (published June 29, 2004)
Proposed Technical Amendments - Test Procedures for Testing Highway and Nonroad Engines and Omnibus Technical Amendments (published September 10, 2004)
Proposed Rule - Emission Standards for Evaporative Emissions from Recreational Boats and Exhaust Emissions from Highway Motorcycles (published August 14, 2002)
Proposed Rule: Control of Emissions of Air Pollution from New Marine Compression-Ignition Engines At or Above 30 Liters/Cylinder (Tier 1 Category 3 Marine Diesel Engine Proposal published May 29, 2002)
Proposed Emission Standards (published October 5, 2001)
Advance Notice of Proposed Rulemaking - Control of Emissions from Nonroad Large Spark-Ignition Engines, Recreational Engines (Marine and Land-Based), and Highway Motorcycles (published December 7, 2000)
Proposed Finding for Large SI and Land-based Recreational SI Engines (published February 8, 1999)
Supplemental Notice of Proposed Rulemaking - Phase 2 Emission Standards for Handheld Engines (published July 28, 1999)
Notice of Proposed Rulemaking for Small Nonroad Spark-Ignition Engines, Amendments 40 CFR Part 90 (published February 3, 1999)
Proposed Phase 2 Emission Standards for Small SI Engines (published January 27, 1998)
March 1997 Phase 2 ANPRM Federal Register Notice
February 1997 Class I OHV Demonstration Program - Memorandums of Understanding
Locomotive Emissions Notice of Proposed Rulemaking (published February 11, 1997)
Statement of Principles for Nonhandheld Engines
Statement of Principles for Handheld Engines
Proposed settlement with Sierra Club; request for public comment - Federal Register Notice, November 29, 1996
Tier 2 and Tier 3 Proposed Emission Standards
  • Statement of Principles to Control Emissions of Air Pollution from Nonroad Diesel Engines - Supplemental Advance Notice of Proposed Rulemaking
    Availability of the Statement of Principles (SOP) for nonroad diesel engines which was signed by EPA, the California Air Resources Board, and members of the nonroad diesel engine industry. The SOP calls for significantly more stringent standards for emissions of NOx, HC, and PM from diesel engines used in most land-based nonroad equipment and some marine applications.
  • Staff Technical Paper for Advanced Technologies in Nonroad Diesel Engines
    In 1998, EPA adopted more stringent emissions standards for nonroad diesel engines. In that rulemaking, EPA indicated that in 2001 it would review the upcoming Tier 3 portion of those standards (and the Tier 2 emission standards for engines under 50 horsepower) to assess whether or not the new standards were technologically feasible. This staff technical paper presents the preliminary assessment of the technological feasibility of the Tier 2 and Tier 3 emission standards.
  • Tier 2 and Tier 3 Emission Standards - Proposed Rule
    Proposal for more stringent emission standards for nonroad diesel engines used in construction, agricultural, and industrial equipment and some marine applications. The proposed program would represent a major step toward reducing the harmful health effects of ozone and particulate matter (PM) nationwide.
Proposed Rule (published June 10, 2004) - Control of Emissions of Air Pollution from New Motor Vehicles:  In-Use Testing for Heavy-duty Engines and Vehicles
Fact Sheet: Notice of a 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.
Nonroad Diesel Engine Elements of Settlement (PDF) (1 pg, 54K)
Proposed Rule - Proposed Nonconformance Penalties for 2004 and later Model Year Emission Standards for Heavy-duty Diesel Engines and Heavy-duty Diesel Vehicles (published January 16, 2002)
October 1999  Proposed Rule - Control of Emissions of Air Pollution from 2004 and Later Model Year Heavy-duty Highway Engines and Vehicles; Revision of Light-duty Truck Definition

 

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