Laws & Regulations

Operating Permit Timeline for Texas

Proposed Rule and Correction for Control of Air Pollution From New Motor Vehicles: In-Use Testing for Heavy-Duty Diesel Engines and Vehicles

Final Rule for Control of Air Pollution From New Motor Vehicles: In-Use Testing for Heavy-Duty Diesel Engines and Vehicles

Clean Heavy-Duty Vehicles Program

Information on the Inflation Reduction Act's investment to replace existing heavy-duty vehicles with cleaner, zero-emission vehicles, support zero-emission vehicle infrastructure, and to train and develop workers.

Advance Notice of Proposed Rulemaking and Related Materials on Lead Emissions From Piston-Engine Aircraft Using Leaded Aviation Gasoline

Includes links to Federal Register notices, fact sheets, request public comment, petitions, and EPA memorandums.

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

EPA is publishing an Advance Notice of Proposed Rulemaking concerning emissions from new nonroad vehicles and engines that are currently unregulated, and highway motorcycles.

California Greenhouse Gas Waiver Request

On July 8, 2009, EPA granted a waiver of Clean Air Act preemption to California for its greenhouse gas emission standards for motor vehicles beginning with the 2009 model year.

Direct Final Rule for Amendments to Regulations for Heavy-Duty Diesel Engines

Direct Final Rule for Amendments to the Phase 2 Requirements for Spark-Ignition Nonroad Engines at or Below 19 Kilowatts

Amendments published January 12, 2004 containing two revisions intended to increase flexibility in the averaging, banking, and trading program as it applies to handheld engines.

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.