Previously Proposed Emission Standards

This page includes a collection of previously proposed emission standards. See final regulations for at Nonroad Engines, Equipment, and Vehicles.

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 Emission Standards (published May 18, 2007)

Fact Sheet: Proposed Emission Standards for New Nonroad Spark-ignition Engines, Equipment, and Vessels | PDF Version (4 pp, 98K, EPA420-F-07-032)
Regulation (Entire document PDF) (297 pp, 4M) 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 40CFR parts 1065 (PDF) (83 pp, 1.3MB), and 1068 (PDF) (48 pp, 628K)
Draft Regulatory Impact Analysis (PDF) (709 pp, 6.3MB, EPA420-D-07-004) Instead of downloading the entire document, you can access the individual chapters.
Peer review report: Estimated cost for Phase 3 standards (PDF) (60 pp, 3.2MB)

EPA Safety Study

EPA Technical Study on the Safety of Emission Controls for Nonroad Spark-Ignition Engines < 50 Horsepower
- Entire Document (PDF) (zip file of a PDF, 9.7MB, EPA420-R-06-006, March 2006) NOTE: Since the file is so large, it may take a long time to download even with a high-speed connection. Large downloads work best when you are not attempting to run other applications on your computer and when traffic on your network is low. (Free zip software is available at http://www.download.com )
- Report and Appendices A and B (PDF) (170 pp, 6.7MB)
- Appendix C (PDF) (152 pp, 3.8MB)
Peer reviews of EPA Safety Study, with responses (PDF) (44 pp, 255K)
Fact Sheet: Program Update: EPA Technical Study on the Safety of Emission Controls for Nonroad Spark-Ignition Engines Below 50 Horsepower | PDF Version (6 pp, 602K, EPA420-F-06-029, March 2006)

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)

Fact Sheet: Regulatory Announcement: EPA Proposes More Stringent Emissions Standards for Locomotives and Marine Compression-Ignition Engines | PDF Version (6 pp, 127K, March 2007, EPA420-F-07-015)
Fact Sheet: Plain Language Format of Emission Regulations | PDF Version (6 pp, 191K, EPA420-F-07-037, June 2007)
Proposed Rule:
Part 1, pp 15937-15986 | PDF Version (1.36MB)
Part 2, pp 15987-16036 | PDF Version (899K)
Part 3, pp 16037-16086 | PDF Version (887K)
Part 4, pp 16087-16136 | PDF Version (1.1MB)
Part 5, pp 16137-16151 | PDF Version (398K)
Redline version highlighting proposed changes for 40 CFR parts 1065 (PDF) (83 pp, 1.3MB) and 1068 (PDF) (48 pp, 628K)
Draft Regulatory Impact Analysis (PDF) (768 pp, 23MB, EPA420-D-07-001) Instead of downloading the entire document, you can access the individual chapters of the Draft Regulatory Impact Analysis.
Supporting Documentation: Information related to the development of this proposal can be found on the electronic docket at www.regulations.gov. (NOTE: To access the docket, select Advanced Search, then Docket Search, and type EPA-HQ-OAR-2003-0190 as the Docket ID.)

Advance Notice of Proposed Rulemaking (ANPRM): Reducing Emissions for Locomotive and Marine Diesel Engines (published June 29, 2004)

Federal Register Notice (also available as a PDF file, 15 pages, 273K)
Press Release: New Clean Diesel Rule Major Step in a Decade of Progress (May 11, 2004)
Press Release: Leavitt to Sign Clean Air Nonroad Diesel Rule (May 10, 2004)
Fact Sheet: EPA's Program for Locomotives and Marine Diesel Engines (also available as a PDF file, 3 pp, 117K, EPA420-F-04-041, May 2004)
Inventory Issues for Comment (PDF) (3 pp, 45K)

Proposed Technical Amendments - Test Procedures for Testing Highway and Nonroad Engines and Omnibus Technical Amendments (published September 10, 2004)

Fact Sheet: Proposed Changes to Test Procedures for Nonroad Engines and Heavy-Duty Highway Engines (PDF) (3 pp, 104K, EPA420-F-04-046, August 2004)
Federal Register Notice: Test Procedures for Testing Highway and Nonroad Engines and Omnibus Technical Amendments (PDF) (171 pp, 1.8MB)
- Part A: Pages 54845-54894 (also available as a PDF file, 50 pp, 292K)
- Part B: Pages 54895-54944 (also available as a PDF file, 50 pp, 772K)
- Part C: Pages 54945-54994 (also available as a PDF file, 50 pp, 772K)
- Part D: Pages 54995-55015 (also available as a PDF file, 21 pp, 348K)
Technical Support Document: Test Procedures for Highway and Nonroad Engines and Omnibus Technical Amendments (PDF) (70 pp, 808K, EPA420-D-04-004, August 2004)

Proposed Rule - Emission Standards for Evaporative Emissions from Recreational Boats and Exhaust Emissions from Highway Motorcycles (published August 14, 2002)

Fact Sheet: Proposed Emission Standards for New Highway Motorcycles and Recreational Boats (PDF) (5 pp, 15K, EPA420-F-02-007, July 2002)
Frequently Asked Questions: Proposed Emission Standards for Highway Motorcycles (PDF) (5 pp, 14K, EPA420-F-02-010, July 2002)
Press Release (July 26, 2002)
Federal Register Notice (also available as a PDF file, 67 pp, 405K, published August 14, 2002)
Draft Regulatory Support Document: Control of Emissions from Spark-Ignition Marine Vessels and Highway Motorcycles (PDF) (185 pp, 984K, EPA420-D-02-003, July 2002)
Final Report of the Small Business Advocacy Review Panel - Control of Emissions from Nonroad Large Spark Ignition Engines, Recreational Engines (Marine and Land-based), and Highway Motorcycles (PDF) (60 pp, 303K, EPA420-R-01-049, September 2001)
Docket Index (PDF) (107 pp, 460K)
See the Advance Notice of Proposed Rulemaking.

Proposed Emission Standards (published October 5, 2001)

Fact sheet: Emission Standards for New Nonroad Engines (EPA420-F-01-026)
Federal Register Notice (published October 5, 2001)
Draft Regulatory Support Document (EPA420-D-01-004)
- Draft Regulatory Support Document by Chapter
Frequently Asked Questions: Emission Standards for Industrial Spark-ignition Engines (EPA420-F-01-028)
Large SI Engine Technologies and Costs (EPA420-R-01-045)
Final Report of the Small Business Advocacy Review Panel - Control of Emissions from Nonroad Large Spark Ignition Engines, Recreational Engines (Marine and Land-based), and Highway Motorcycles
Other documents regarding the proposed rule are available at http://www.epa.gov/otaq/proposal/cleanrec.htm

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)

Fact Sheet: Emission Standards for New Nonroad Engines and Highway Motorcycles (PDF) (15K, EPA420-F-00-046, November 2000)
Federal Register Notice - Final Finding (PDF) (237K, Published December 7, 2000)
Federal Register Notice - Advance Notice of Proposed Rulemaking (PDF) (279K, Published December 7, 2000)
Summary and Analysis of Comments on the Proposed Finding (PDF) (56K, EPA420-R-00-022, November 2000)
Memo: Updated Emission Modeling for Large SI Engines (PDF) (47K, EPA420-F-00-049, November 2000)
Memo: Emission Data and Procedures for Large SI Engines (PDF) (95K, EPA420-F-00-050, January 2, 2001)

Proposed Finding for Large SI and Land-based Recreational SI Engines (published February 8, 1999)

Federal Register Notice (published February 8, 1999) (also available as a PDF file, 60K)
Fact Sheet: Proposed Finding on Emission Standards for New Large Spark-Ignition Nonroad Engines (PDF) (15K, EPA420-F-99-004, January 1999)
Supporting Memorandum: California Requirements for Large SI Engines and Possible EPA Approaches (PDF) (45K)
Supporting Memorandum: Emission Modeling for Large SI Engines (PDF) (35K)
Memorandum 1A: Tampering Enforcement Policy

Supplemental Notice of Proposed Rulemaking - Phase 2 Emission Standards for Handheld Engines (published July 28, 1999)

Fact Sheet: Reproposed Phase 2 Standards for Small Spark-Ignition Handheld Engines (also available as a PDF file, 6 pp, 36K, EPA420-F-99-027, June 1999)
Federal Register Notice (also available as a PDF file, 34 pp, 202K)
Regulatory Impact Analysis (PDF) (190 pp, 613K)
RIA Spreadsheets
- Tables for Appendix B of the RIA 87K Lotus-123
- Tables for Appendix C of the RIA 82K Lotus-123
- Tables for Appendix E of the RIA 260K Lotus-123
- Tables for Appendix F of the RIA 42K MS-Excel5

Notice of Proposed Rulemaking for Small Nonroad Spark-Ignition Engines, Amendments 40 CFR Part 90 (published February 3, 1999)

Federal Register Notice (also available as a PDF file, 8 pp, 63K)

Proposed Phase 2 Emission Standards for Small SI Engines (published January 27, 1998)

Fact Sheet (PDF) (5 pp, 24K)
Federal Register Notice (also available as a PDF file, 88 pp, 686K)
Regulatory Support Document:
- Chapter 1: Contents/Intro (PDF (15 pp, 83K)
- Chapter 2: Test Cycle/Tests Procedures (PDF) (11 pp, 116K)
- Chapter 3: Technologies and Standards (PDF) (50 pp, 273K)
- Chapter 4: Technology Market Mix/Cost Estimates (PDF) (39 pp, 925K)
- Chapter 5: Compliance Program Costs (PDF) (28 pp, 184K)
- Chapter 6: Environmental Benefit (PDF) (19 pp, 76K)
- Chapter 7: Analysis of Aggregate Costs (PDF) (18 pp, 145K)
- Chapter 8: Potential Impacts on Small Entities (PDF) (25 pp, 184K)
- Chapter 9: Useful Life and Flexibility Supporting Data (PDF) (40 pp, 800K)
Regulatory Support Document Appendices 86K Lotus 1-2-3, 280K Lotus 1-2-3, 304K Lotus 1-2-3 and 54K Lotus 1-2-3

March 1997 Phase 2 ANPRM Federal Register Notice

Fact Sheet (PDF) (2 pp, 12K, EPA420-F-97-001, March 1997)

February 1997 Class I OHV Demonstration Program - Memorandums of Understanding

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.
- Federal Register Notice (also available as a PDF file, 25 pp, 109K, published January 2, 1997)
- Fact Sheet: Statement of Principles for Nonroad Diesel Engines (PDF) (4 pp, 13K, EPA420-F-96-015, September 1996)
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.
- Nonroad Diesel Emissions Standards: Staff Technical Paper (PDF) (40 pp, 155K, EPA420-R-01-052, October 2001)
- Notice of Availability: Federal Register Notice (also available as a PDF file, 1 pg, 32K, published November 20, 2001) (Comment period closed January 4, 2002)
- Memo regarding comments Docket A-2001-28 (PDF) (17 pp, 79K, June 4, 2002)
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.
- Federal Register Notice (also available as a PDF file, 69 pp, 590K, published September 24, 1997)
- Press Release: EPA Cut Diesel Engine Pollution (October 7, 1997)
- Fact Sheet: Proposed New Emission Standards for Nonroad Diesel Engines (PDF) (4 pp, 13K, EPA420-F-97-020, September 1997)
- Final Report of the SBREFA Small Business Advocacy Review Panel for Control of Emissions of Air Pollution from Nonroad Diesel Engines (PDF) (also available as a PDF file, 26 pp, 128K, May 23, 1997)
- Memo to the Docket: "Emission Inventories Used in the Nonroad Diesel Proposed Rule" (August 27, 1997)
  - Memorandum (PDF) (7 pp, 18K)
  - Spreadsheet (PDF) (1 pg, 7K) also available as a 8K Excel3)

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: Proposed In-Use Testing Program for Heavy-Duty Diesel Engines and Vehicles (PDF) (4 pp, 117K, EPA420-F-04-042, June 2004)
Federal Register Preamble: Control of Emissions of Air Pollution From New Motor Vehicles: In-Use Testing for Heavy-Duty Diesel Engines and Vehicles; Proposed Rule (PDF) (20 pp, 180K, June 2004)
Federal Register Regulatory Language: Control of Emissions of Air Pollution from New Motor Vehicles: In-Use Testing for Heavy-duty Engines and Vehicles (PDF) (10 pp, 140K)
Draft Technical Support Document: In-Use Testing for Heavy-Duty Diesel Engines and Vehicles (PDF) (55 pp, 668K, EPA420-D-04-003, June 2004)

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.

Fact Sheet: Notice of a Settlement Agreement with the Engine Manufacturers Association to Propose a Manufacturer-Run, In-Use Emissions Testing Program for Heavy-Duty Diesel Trucks and to Provide Engine Certification Guidance (PDF) (4 pp, 114K, EPA420-F-03-019, June 2003)
Final Court Settlement Document (PDF) (9 pp, 74K)
Attachments to Court Settlement Document
- Heavy-duty Diesel Engine In-Use Testing Program Outline (PDF) (10 pp, 162K)
- Heavy-duty Engine Certification Q&A (PDF) (9 pp, 102K)
- Marine Diesel Engine Q&A (PDF) (10 pp, 205K)

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)

Fact Sheet: Nonconformance Penalties for Heavy-duty Diesel Engines (PDF) (4 pp, 13K, EPA420-F-01-034, December 2001)
Preamble and Regulatory text (also available as a PDF file, 17 pp, 144K, 67 FR 2159, January 16, 2002)
Draft Technical Support Document: Nonconformance Penalties for 2004 Highway Heavy Duty Diesel Engines (PDF) (58 pp, 182K, EPA420-D-02-001, January 2002)
Corrections to Tables in the Draft Technical Support Document for the Nonconformance Penalty Rulemaking (PDF) (3 pp, 29K, January 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

Public Hearing Transcript (PDF) (241 pp, 316K)
Press Release: Control of Emissions of Air Pollution From 2004 and Later Model Year Highway Engines and Vehicles; Revision of Light-duty Truck Definition
Fact Sheet: Proposed Strategy to Reduce Emissions from Heavy Duty Vehicles (PDF) (4 pp, 17K, EPA420-F-99-034, October 1999)
Preamble and Regulations (PDF) (434 pp, 936K)
Regulatory Impact Analysis (PDF) (145 pp, 777K)

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