Air Quality Conformity

Transportation-air quality conformity ("conformity") is a way to ensure that Federal funding and approval goes to transportation activities that are consistent with air quality goals.  Conformity applies to metropolitan transportation plans, to transportation improvement programs (TIPs), and to projects funded or approved by the Federal Highway Administration (FHWA) or the Federal Transit Administration (FTA) in areas that do not meet -- or have recently not met -- air quality standards for ozone, carbon monoxide, particulate matter, or nitrogen dioxide.  These areas are known as "non-attainment areas" or "maintenance areas," respectively.  


A conformity determination demonstrates that the total emissions projected for a plan or program are within the emissions limits ("budgets") established by the State Implementation Plan (SIP) for air quality, and that transportation control measures (TCMs) – specific projects or programs enumerated in the SIP that are designed to improve air quality – are implemented in a timely fashion.  All of the area within the Triangle covered by the two MPOs, except for Harnett County, is currently designated as a “maintenance area” for the 8-hour ozone standard.


Listed below are documents associated with the air quality conformity determination for the Triangle’s 2045 Metropolitan Transportation Plan, and for the 2018-27 Transportation Improvement Program: