Surface Transportation Block Grant & Congestion Mitigation and Air Quality Improvement Programs


The Surface Transportation Block Grant (STBG) program is a federal funding source that may be used for projects to preserve and improve the conditions and performance of highways, bridges, and public roads pedestrian and bicycle infrastructure; and transit capital projects. The Congestion Mitigation and Air Quality (CMAQ) Improvement Program is a federal funding source for transportation projects and programs 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 (nonattainment areas) and for former nonattainment areas that are now in compliance (maintenance areas).


Questions regarding STBG and CMAQ funding should be directed to:
Heidi Busslinger
Principal Planner, Federal Transportation Improvement Program


Approximately *$130 million in STBG apportionments and *$57 million in CMAQ apportionments for federal fiscal year (FFY) 2023 through FFY 2026 is available for the SCAG region. SCAG will initiate a joint solicitation for project nominations for these available apportionments totaling $187 million along with the available Carbon Reduction Program (CRP) apportionments following the schedule below.

*Actual apportionment amounts may differ.

Eligible Applicants and Nomination Process 

As of July 1, 2023, SCAG is responsible for the selection of STBG/CMAQ-funded projects in the SCAG region. Projects will be selected through a solicitation for project nominations process consistent with the approved STBG/CMAQ Program Guidelines.

Eligible applicants for STBG and CMAQ funding include SCAG cities, counties, transit agencies, federally recognized Tribal governments and county transportation commissions. Each county transportation commission is responsible for the coordination and submission of project nominations to SCAG from eligible entities in their respective counties. Local project sponsors should contact their county transportation commission regarding the project nomination process.

SCAG will review project nominations submitted by the county transportation commissions against the program criteria and develop a list of prioritized projects for approval by the SCAG Regional Council. Projects approved by SCAG for STBG and CMAQ funding must be programmed in the Federal Transportation Improvement Program (FTIP).

  • Solicitation for Nominations Opens: Jan. 4, 2024
  • Solicitation for Nominations Deadline: March 29, 2024
  • SCAG Regional Council Awards Funding: June 2024