Flexible Funding Programs - Congestion Mitigation and Air Quality Program - 23 USC 149

CMAQ provides funding to areas in nonattainment or maintenance for ozone, carbon monoxide, and/or particulate matter. States that have no nonattainment or maintenance areas still receive a minimum apportionment of CMAQ funding for either air quality projects or other elements of flexible spending.  Funds may be used for any transit capital expenditures otherwise eligible for FTA funding as long as they have an air quality benefit.