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Congestion Mitigation and Air Quality Improvement (CMAQ) Program

CMAQ Essentials

The Congestion Mitigation and Air Quality Improvement (CMAQ) program provides a flexible funding source for State and local governments to fund transportation projects and programs to help meet the requirements of the Clean Air Act (CAA) and its amendments. The legislation is codified at 23 USC Sec 149. CMAQ money supports transportation projects that reduce mobile source emissions in areas designated by the U.S. Environmental Protection Agency (EPA) to be in nonattainment or maintenance of the national ambient air quality standards. Since its beginning in 1992, the CMAQ program has provided more than $30 billion for over 29,000 transportation-related emission reduction projects for State transportation departments (DOTs), metropolitan planning organizations (MPOs), and other sponsors across the country.

Examples of CMAQ Eligible Projects and Programs

Key CMAQ Funding Requirements

CMAQ under the FAST Act

The FAST Act continues eligibility for electric vehicle (EV) and natural gas vehicle infrastructure and adds priority for infrastructure located on designated travel corridors. The Act also specifically makes the installation of vehicle-to-infrastructure communications equipment an eligible project activity. Further, the FAST Act amended the eligible uses of CMAQ funds set aside for PM2.5 nonattainment and maintenance areas. PM2.5 set-aside funds may be used to reduce fine particulate matter emissions in a PM2.5 nonattainment or maintenance area, including diesel retrofits; and installation of diesel emission control technology on non-road diesel equipment or on-road diesel equipment that is operated on a highway construction projects.

For more information, please contact:
U.S. Department of Transportation Federal Highway Administration
Office of Natural Environment
1200 New Jersey Avenue, S.E.
Washington, D.C. 20590

Updated: 10/4/2017
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