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Transportation Conformity

Transportation Conformity is a federal requirement in nonattainment areas to conduct air quality analysis on projects, programs, and policies identified in transportation plans, transportation improvement programs, federally funded projects, or projects requiring federal approval.  Conformity determinations must demonstrate consistency between emissions expected from the implementation of transportation plans and programs and Motor Vehicle Emission Budgets (MVEBs) in the applicable implementation plan.  To meet this criterion, conformity determinations in nonattainment areas with adequate MVEBs from an applicable State Implementation Plan (SIP), must perform a MVEB test.  For the MVEB test, the emissions analysis must demonstrate the estimated emissions are less than the MVEBs in the applicable implementation plan.

The determination of the analysis is a two-step process in metropolitan areas.  The first step is for the Metropolitan Planning Organization (MPO) to make the initial transportation conformity determination at the local level.  For the North Central Texas nonattainment area, this responsibility falls with the Regional Transportation Council (RTC), the MPO’s policy body.  The second step is for the Federal Highway Administration (FHWA) and Federal Transit Administration (FTA) to make a joint transportation conformity determination at the federal level.  Upon favorable federal approval, a four-year window begins during which projects, programs, and policies identified in the Metropolitan Transportation Plan and Transportation Improvement Program may move toward implementation.

2018 Transportation Conformity Analysis and Documentation
Mobility 2045 Documentation
2019-2022 TIP Documentation

2018 Transportation ConformityDallas-Fort Worth (DFW) 2008 Eight-Hour Ozone Nonattainment Area Attainment Demonstration (AD) State Implementation Plan (SIP) Revision for the 2017 Attainment Year was adopted on July 6, 2016.  On November 8, 2016, the Environmental Protection Agency published the Adequacy Status of the Dallas-Fort Worth, Texas Attainment Demonstration 8-Hour Ozone Motor Vehicle Emission Budgets for Transportation Conformity Purposes, effective November 23, 2016
 (81 FR 78591).



2015 8-hour Ozone NAAQS Nonattainment Designations NEW!

EPA 2015 8-hour Ozone NAAQS Designations Publication in Federal Register NEW!

       Nonattainment Designations Letter to Governor Greg Abbott NEW!

       EPA 2015 8-hour Ozone NAAQS Final Rule NEW!


Previous Conformity Determination Letters


DFW Nonattainment Area Conformity Milestones


Transportation Conformity: A Basic Guide for State & Local Officials

Federal Highway Administration

Environmental Protection Agency


6/20/2018   JL/MG %Trans

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