Tools and guidance to assist in the environmental documentation of the air quality and conformity impact of a proposed project.
Legal Requirements
General
FHWA - Policy and Guidance on Air Quality
FHWA - Transportation Conformity Policy
FHWA - Transportation Conformity Guidance
Specific
Transportation conformity state implementation plan (SIP) and interagency consultation (WisDOT, WDNR, FHWA, FTA, EPA, and designated MPOs)
DNR/WisDOT MOA,
Transportation Conformity MOA
FDM References
FDM 22 Air Quality
FDM 20-5-15 Major State Agreement Documents - WisDOT-WDNR cooperative agreement
National Ambient Air Quality Standards (NAAQS) for Criteria Pollutants
Wisconsin Ozone and PM 2.5 NAAQS Status
September 17, 2025
EPA - Criteria Air Pollutants Webpage
EPA - Nonattainment Areas for Criteria Pollutants (Green Book)
FHWA Information
Transportation Infrastructure Resilience
Wisconsin Department of Natural Resources Information
Wisconsin Statewide Air Quality Monitoring Data
Wisconsin DNR Air Quality Webpage