Congestion Mitigation and Air Quality (CMAQ)

(Federal Funding)

FAST Act CMAQ Allocations


The CMAQ program provides a flexible funding source to State and local governments for transportation projects and programs to help meet the requirements of the Clean Air Act. Funding is available to reduce congestion and improve air quality for areas that do not meet the National Ambient Air Quality Standards for ozone, carbon monoxide, or particulate matter (PM) (nonattainment areas) and for former nonattainment areas that are now in compliance (maintenance areas).

Since 1991, the federal transportation acts distributed CMAQ funding in two separate allocations: minimum apportionment and area weighted apportionment. The minimum apportionment was available to all MPO areas no matter the type of pollution. The area weighted apportionment was split only between those areas with ozone and carbon monoxide areas (Puget Sound, Spokane, Vancouver).

In 2013, funding allocations to the states were modified to provide a lump sum allocation to the state, with only a set-aside for the PM 2.5 area (Puget Sound). The decision was made by the MPOs to maintain the distribution from 2012, allowing them to identify and fund projects that reduce congestion and improve air quality to meet the requirements of the Clean Air Act. Allocations are provided to the five MPOs at the percentage, with a set-aside for the PM 2.5 area (Puget Sound).


The FAST Act requires WSDOT to report to FHWA annually on the CMAQ project obligations and associated air quality benefits for the project. These submission are included in the national database of CMAQ investments, air quality benefits. The information is utilized by FHWA personnel for Congressional reporting and available to states and MPOs on an individual request basis. Also, FHWA has released a CMAQ Public Access System that provides the opportunity for the general public to have access to the FHWA approved data at: