In this action, EPA proposed emission standards for several groups of nonroad engines that cause or contribute to air pollution but that had yet to be regulated by EPA. These engines include large spark-ignition engines such as those used in forklifts and airport tugs; recreational vehicles using spark-ignition engines such as off-highway motorcycles, all-terrain vehicles, and snowmobiles; and recreational marine diesel engines. Nationwide, engines and vehicles in these various categories contribute to ozone, CO, and PM nonattainment.

• Proposed Rule; Re-opening of Comment Period (PDF)(5 pp, 146 K, published May 2002)
• Proposed Rule (PDF)(176 pp, 1 MB, published October 5, 2001)

Rule History

• Advance Notice of Proposed Rulemaking for Control of Emissions From Nonroad Large Spark-Ignition Engines, Recreational Engines (Marine and Land-Based), and Highway Motorcycles

Related Materials

Fact Sheet

• Emission Standards for New Nonroad Engines (PDF)(6 pp, 56 K, EPA-420-F-01-026, published September 2001)

Draft Regulatory Support Document

• Draft Regulatory Support Document (PDF)(310 pp, 927 K, EPA-420-D-01-004, published September 2001)

Technical Support Document

• Report of the Small Business Advocacy Review Panel On Emissions Standards for New Compression-ignition and Spark-ignition Recreational Marine Engines (PDF)(43 pp, 181 K, EPA-420-R-01-048, published September 2001)

Contractor Reports

• Nonroad Recreational Vehicle Technologies and Costs Draft Final Report (PDF)(37 pp, 187 K, EPA-420-R-01-044, published September 2001)
• Characterization of Off-Road Motorcycle Use Draft Final Report (PDF)(48 pp, 264 K, EPA-420-R-01-046, published September 2001)
• Large SI Engine Technologies and Costs Draft Final Report (PDF)(20 pp, 106 K, EPA-420-R-01-045, published September 2001)

Frequently Asked Questions

• Emission Standards for Off-Highway Motorcycles (PDF)(4 pp, 14 K, EPA-420-F-01-025, published September 2001)
• Emission Standards for All-Terrain Vehicles (ATVs) (PDF)(3 pp, 14K, EPA-420-F-01-027, September 2001)
• Emission Standards for Snowmobiles (PDF)(3 pp, 15 K, EPA-420-F-01-024, published September 2001)
• Emission Standards for Industrial Spark-ignition Engines (PDF)(3 pp, 14 K, EPA-420-F-01-028, published September 2001)
• Emission Standards for Recreational Marine Diesel Engines (PDF)(3 pp, 15 K, EPA-420-F-01-029, published September 2001)
• Environmental Impacts of Recreational Vehicles and Other Nonroad Engines (PDF)(6 pp, 183 K, EPA-420-F-01-030, published September 2001)