Air Quality Conformity

The Federal Clean Air Act and the transportation planning provisions of Title 23 and Title 49 of the United States Code are intended to ensure that integrated transportation and air quality planning occurs in the areas that do not or previously have not met the National Ambient Air Quality Standards (NAAQS). These areas, known as nonattainment or maintenance areas respectively, require a process to demonstrate that transportation projects included in the region’s Long-Range Plan (LRP) or Transportation Improvement Program (TIP) will not impede a region's progress towards meeting or maintaining the federal air quality standards.

Transportation conformity is the federally mandated analytical process through which Metropolitan Planning Organizations (MPOs) demonstrate that the transportation investments, strategies, and programs included in the LRP and TIPs are consistent with air quality goals established in State Implementation Plans (SIP) for achieving the NAAQS. Conformity demonstrations show that emissions from projects in transportation plans and programs do not exceed the SIP targets ("budgets") for emissions from mobile sources.


The nine-county DVRPC planning area is part of the:

  • Philadelphia-Wilmington-Atlantic City Ozone Nonattainment Area
  • Philadelphia-Wilmington, PA-NJ-DE PM2.5 Maintenance Area
  • New York - Northern New Jersey - Long Island, NY-NJ-CT PM2.5 Maintenance Area
  • Delaware County PM2.5 Nonattainment Area

On June 28, 2018, the DVRPC Board adopted the "Transportation Conformity Determination: Connections 2045 Long-Range Plan and FY 2019 TIP for Pennsylvania". This is the current transportation conformity determination for the Pennsylvania portion of the region and replaces the previous determination adopted in November 2017. The conformity finding for the New Jersey portion of the region was adopted in October 2017 and remains in effect.

Adopted Conformity Document

The DVRPC Board adopted the following document in June 2018. This is the CURRENT Transportation Conformity document for:

  • the Connections 2045 Long-Range Plan (Pennsylvania portion of the region),
  • the FY 2019-2022 TIP for Pennsylvania

The DVRPC Board adopted the following document in October 2017. This is the CURRENT Transportation Conformity document for:

  • the Connections 2045 Long-Range Plan (New Jersey portion of the region),
  • the FY 2018-2021 TIP for New Jersey

For more information on transportation conformity, visit the FHWA or EPA webpages.