Congestion Mitigation Air Quality (CMAQ)

The Congestion Mitigation and Air Quality (CMAQ) Improvement Program was created in 1991 under the Intermodal Surface Transportation Efficiency Act (ISTEA) to support surface transportation projects and other related efforts that contribute air quality improvements and provide congestion relief. 

Eligible projects for CMAQ include but are not limited to:

  • Transit Vehicle Engine Retrofits and Vehicle Replacements
  • Street Sweeper and School Bus Engine Retrofits and Vehicle Replacements
  • Transit Service Improvements
  • Traffic Flow Improvements
  • Bicycle and Pedestrian Improvements

CMAQ Program Call for Projects


On August 13, 2019, SJCOG solicited a call for projects for the CMAQ Program.  Approximately $20.5 million was available for eligible projects in San Joaquin County, to be programmed in Fiscal Years 2020/21, 2021/22, and 2022/23. Applications were due October 25, 2019.

On February 27, 2020, the SJCOG Board of Directors approved the Congestion Mitigation and Air Quality programming recommendations, which included two unfunded projects be placed on a CMAQ contingency list that would expire upon the start of the next CMAQ call for projects. 

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