Laws & Regulations

Direct Final Rule: Amendments to Emission Requirements Applicable to New Nonroad CI Engines at or Above 37 Kilowatts: Provisions for Replacement CI Engines and the Use of On-Highway CI Engines in Nonroad Vehicles

Amendments adopting the original replacement-engine exemption for nonroad engines and nonroad vehicle manufacturers to use certified highway engines in nonroad vehicles in certain circumstances.

Proposed Rule and Related Materials for Phase 2 Emission Standards for New Nonroad Spark-Ignition Handheld Engines At or Below 19 Kilowatts

Includes link to Federal Register and factsheets.

Direct Final Rule for Control of Air Pollution From Aircraft and Aircraft Engines; Emission Standards and Test Procedures

This rule will adopt the current voluntary NOx and CO emissions standards of the United Nations International Civil Aviation Organization (ICAO), bringing the United States aircraft standards into alignment with the international standards.

Direct Final Rule for Extension of Temporary Exhaust Emission Test Procedure Option for All Terrain Vehicles

Information on rule released to allow ATV manufacturers up to six additional years to use the alternative steady-state test procedure and associated standards.

Direct Final Rule for Fuel Economy Regulations for Automobiles: Technical Amendments and Corrections

EPA is taking direct final action amending and correcting portions of the Environmental Protection Agency’s existing fuel economy and emission regulations.

Direct Final Rule for Control of Emissions of Air Pollution From Diesel Fuel

Direct Final Rule for Amendments to Regulations for Control of Emissions of Air Pollution From Diesel Fuel

Final Rule for Control of Air Pollution from New Motor Vehicles: Heavy-Duty Engine and Vehicle Standards and Highway Diesel Fuel Sulfur Control Requirements

Includes Federal Register notice, Regulatory Impact Analysis, Response to Comments, rule history, fact sheet and technical support document.

Proposed Rule for Control of Air Pollution From New Motor Vehicles: Proposed Heavy-Duty Engine and Vehicle Standards and Highway Diesel Fuel Sulfur Control Requirements

Rule summary, CFR citations and additional resources concerning proposed new emission standards that will begin to take effect in 2007 and corresponding diesel fuel requirements that take effect in 2006.

Direct Final Rule for Exhaust Emission Standards for 2012 and Later Model Year Snowmobiles

In this action removing the NOX component from the Phase 3 emission standard calculation and deferring action on the 2012 CO and HC emission standards portion of the court’s remand to a separate rulemaking action.

Direct Final Rule for Heavy-Duty Engine and Vehicle, and Nonroad Technical Amendments

EPA and NHTSA are each adopting corrections to provisions in our respective Medium- and Heavy-Duty Greenhouse Gas Emissions and Fuel Efficiency final rule issued on September 15, 2011.

Partial Withdrawal and Final Rule for Nonroad Technical Amendments

Amendments to the technical hardship provisions under the Transition Program for Equipment Manufacturers related to the Tier 4 standards for nonroad diesel engines, and to the replacement engine exemption generally applicable to new nonroad engines.

Direct Final Rule for Technical Amendments for Marine Spark-Ignition Engines and Vessels

Rule published September 16, 2010 to make technical amendments to the design standard for portable marine fuel tanks. This rule incorporates safe recommended practices, developed through industry consensus.

Final Rule for Control of Emissions From Nonroad Spark-Ignition Engines and Equipment

Includes rule summary, rule history, Federal Register notice, Regulatory Impact Statement, Summary and Analysis of Comments, CFR citations and fact sheets.

Proposed Rule and Related Materials for Control of Emissions From Nonroad Spark-Ignition Engines and Equipment

Includes links to Federal Register notice, Final Rule, fact sheet, draft regulatory impact analysis and technical studies.

Direct Final Rule for In-Use Testing for Heavy-Duty Diesel Engines and Vehicles; Emission Measurement Accuracy Margins for Portable Emission Measurement Systems and Program Revisions

Includes rule summary, links to Federal Register, Technical Support Document, fact sheet and additional resources.