Explore the links provided on this page for more information on regulatory guidance and a broad range of air quality topics associated with reducing emissions from transportation and other mobile sources of air pollution. 

Regulatory and Guidance

• EPA's Office of Air and Radiation Policy and Guidance
  Provides regulators, the regulated community, and members of the general public with easy access to current and historical regulatory information on air quality, including rules and policy and guidance documents.
• U.S. Code of Federal Regulations
  ​Links to the most current Code of Federal Regulations, a multi-volume set of documents that represents a codification of the all the permanent rules published by the executive departments and agencies of the U.S. federal government, including EPA.
• U.S. Department of Energy, Federal and State Incentives and Laws
  Links to current information on federal and state tax incentives available to consumers who purchase alternatively fueled vehicles, including gasoline-electric hybrids.
• U.S. Department of Transportation, Federal Highway Administration Laws and Regulations
  Links to all highway-related laws and regulations, including those pertaining to the environment.

Clean Fuels

• Alternative Fuel Options

Clean Vehicles

• Clean Fleets

In-Use Measures

• Heavy-Duty Retrofits
• Inspection & Maintenance

Industry and Residential Sectors

• Marine Port Strategies

Mobility Management Strategies

• Bike and Pedestrian Programs

Voluntary Programs

• Transportation and Air Quality Programs
• Other EPA Programs