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Reducing Nonroad Diesel Emissions
Clean Air Rules of 2004
The actions described here are part of the suite of inter-related rules collectively known as the Clean Air Rules of 2004. These rules address ozone and fine particle pollution, nonroad diesel emissions, and power plant emissions of sulfur dioxide, nitrogen oxides and mercury.
EPA is proposing a comprehensive national program to reduce emissions from nonroad diesel engines by treating engine controls and reduced sulfur fuel as a system to gain the greatest emission reductions. The proposed emission standards would apply to diesel engines used in most kinds of construction, agricultural, and industrial equipment. Because the emission control devices can be damaged by sulfur, EPA is also proposing to reduce the allowable level of sulfur in nonroad diesel fuel by more than 99 percent.
EPA estimates that affected nonroad diesel engines currently account for about 44 percent of total diesel particulate matter (PM) emissions and about 12 percent of total nitrogen oxides (NOx) emissions from mobile sources nationwide. These proportions are even higher in some urban areas. The proposed diesel emission standards will reduce emissions by more than 90 percent, and are similar to the requirements for engines being implemented for on-road highway trucks and buses.
These reductions in NOx and PM emissions from nonroad diesel engines will provide enormous public health benefits. EPA estimates that by 2030, controlling these emissions would annually prevent 9,600 premature deaths, over 8,300 hospitalizations, and almost a million work days lost.
Areas
Recent air quality data show that about 111 million people live in counties that violate health-based air quality standards for ground-level ozone, also called smog. About 70 million people live in counties that violate health-based air quality standards for PM.
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.
Documents Related to the Proposed Rule
- Proposed Rulemaking (Published May 23, 2003)
by pages:
- Press Release (April 15, 2003)
- Fact Sheet: Summary of EPA's Proposed Program for Low Emission Nonroad Diesel Engines and Fuel (Also available as a PDF file, 19K, EPA420-F-03-008, April 2003)
- Frequently Asked Questions (PDF) (97K, EPA420-F-03-009, April 2003) EPA's Proposed Program for Low-Emission Nonroad Diesel Engines and Fuel
- Public Health and Environmental Benefits of EPA's Proposed Program for Low-Emission Nonroad Diesel Engines and Fuel (PDF) (100K, EPA420-F-03-010, April 2003)
- Reducing Air Pollution from Nonroad Engines (PDF) (151K, EPA420-F-03-011, April 2003)
Draft Regulatory Impact Analysis (EPA420-R-03-008, April 2003)
- Full Text (PDF) (6.7MB, 1,300 pages, with revised version of Chapter 9)
- Individual Chapters:
- Cover, Table of Contents, and Executive Summary (PDF) (57K)
- Chapter 1: Industry Characterization (PDF) (492K)
- Chapter 2: Air Quality, Health, and Welfare Effects (PDF) (1MB)
- Chapter 3: Emissions Inventory (PDF) (434K)
- Chapter 4: Technologies and Test Procedures for Low-Emission Engines (PDF) (1.1MB)
- Chapter 5: Fuel Standard Feasibility (PDF) (367K)
- Chapter 6: Estimated Engine and Equipment Costs (PDF) (362K)
- Chapter 7: Estimated Costs of Low-Sulfur Fuels (PDF) (434K)
- Chapter 8: Estimated Aggregate Cost and Cost Per Ton of Reduced Emissions (PDF) (145K)
- Chapter 9: Cost-Benefit Analysis (PDF) (1.1MB, This file was updated May 7, 2003 as shown in the errata sheet included in the linked files.)
- Chapter 10: Economic Impact Analysis (PDF) (100K)
- Chapter 11: Small-Business Flexibility Analysis (PDF) (100K)
- Chapter 12: Regulatory Alternatives (PDF) (523K)
- Transient duty cycle for variable-speed engines 56K WK4 76K XLS.
- Transient duty cycle for constant-speed engines 53K WK4 72K XLS.
- Docket index as of May 12, 2003 (PDF) (202K)
- Nonroad model used to estimate emission inventories:
Draft NONROAD2002b 6.3M ZIP;
For more detailed documentation see Chapter 3 of the Regulatory Impact Analysis (EPA420-R-03-008) above and the technical reports for NONROAD2002a. - Technical Support Document (PDF) (375K, EPA454-R-03-009, April 2003): Procedures for Developing Base Year and Future Year Mass Emission Inventories for the Nonroad Diesel Engine Rulemaking
Other Fact Sheets of Interest:
- How to Maintain or Rebuild Engines Certified to EPA Standards (PDF) (407K, EPA420-F-02-035, September 2002)
- Emission Regulations for Stationary and Mobile Engines (PDF) (479K, EPA420-F-02-034, September 2002)
- Information about Plain-Language Format of EPA Regulations (PDF) (405K, EPA420-F-02-046, September 2002)