Transportation Conformity

Transportation Conformity ensures that transportation plans, programs and projects do not produce new air-quality violations, worsen existing violations or delay timely attainment of the National Ambient Air Quality Standards (NAAQS).

The ADOT Air Quality Team is responsible for implementing and developing the statutory and regulatory requirements for conformity state implementation plans (conformity SIPs). A conformity SIP includes a state's specific criteria and procedures for certain aspects of the transportation conformity process. Clean Air Act section 176(c) is the statutory authority for transportation conformity (42 U.S.C. 7506(c)). The regulations that explain the requirements for a conformity SIP are found at 40 CFR 51.390, which was updated Jan. 24, 2008 (73 FR 4420).

Project Level Conformity

Project Level Conformity Consultation

Completed Project Level Project of Air Quality Concern (POAQC) and interagency consultation documents will be posted here as applicable.

Project Conformity Consultation - SR 303L, 51st Ave and 43rd Ave Traffic Interchanges, FHWA 327 Conformity Determiniation
Project Conformity Consultation - US 95 from Rifle Range Road to the Wellton ; FHWA 327 Conformity Determination
Project Conformity Consultation - I-10, SR 202L to SR 387
Project Conformity Consultation - Avenue E, State Route 195 to County 18th Street ; FHWA 327 Conformity Determination
Project Conformity Consultation - State Route 101, 75th Avenue to I-17
Project Conformity Consultation - I-10, I-17 (Split) to SR202L (Santan)
Project Conformity Consultation - I-17, Anthem Way to Jct. SR 69 (Cordes Junction) ; FHWA 327 Conformity Determination
Project Conformity Consultation - Signal Butte Road Improvements: Williams Field to Germann Road ; FHWA 327 Conformity Determination
Project Conformity Consultation - I-10, Avondale Blvd to I-17
Project Conformity Consultation - I-10, Kortsen Road Traffic Interchange ; FHWA 327 Conformity Determination
Project Conformity Consultation - I-17, Indian School Traffic Interchange ; FHWA 327 Conformity Determination
Project Conformity Consultation - I-10, SR85 to Verrado Way ; FHWA 327 Conformity Determination
Project Conformity Consultation - Chandler Heights Road: Gilbert Road to Val Vista Drive
Project Conformity Consultation - Ocotillo Road: Gilbert Road to 148th Street
Project Conformity Consultation - I-17: Pinnacle Peak Road TI and Happy Valley Road TI
Project Conformity Consultation - Cooper Road: Riggs Road to Alamosa

Project Level Conformity Hot-Spot Analysis

Completed Project Level Hot-Spot modeling and associated consultation documents required for hot-spot modeling will be posted here as applicable.

CO Hot-Spot Consultation - Happy Valley Road: 67th Avenue to 35th Avenue
- FINAL Air Quality Report Happy Valley Road 67th Avenue to 35th Avenue
CO Hot-Spot Consultation - I-10, I-17 (Split) to SR202L (Santan), FHWA 327 Conformity Determination
CO Hot-Spot Consultation - SR 101, 75th Ave to I-17
- SR101, 75th Ave to I-17 Final Air Quality Report December 2021

Isolated Rural Area Conformity Documents

The U.S. Environmental Protection Agency (EPA) transportation conformity regulations requires certain projects in nonattainment areas to engage in interagency consultation and complete PM2.5/PM10 analyses as part of the project-level conformity determination process. In rural areas, interagency consultation on regional and project level conformity required for federal funded transportation projects is conducted through the ADOT’s Environmental Planning Air Quality staff.

Transportation Conformity also requires that FHWA/FTA projects in PM10 and PM2.5 nonattainment and maintenance areas demonstrate that during the time frame of the transportation plan no new local violations will be created and the severity or number of existing violations will not be increased as a result of the project, and the project has been included in a regional emissions analysis that meets applicable §§ 93.118 and/or 93.119 requirements. The demonstration must be performed according to the consultation requirements of § 93.105(c)(1)(i) and the methodology requirements of § 93.123.

State Route 189 Study: International Border to Grand Avenue project

ADOT provided the draft Arizona Department of Transportation Air Quality Regional Conformity Analysis Nogales Nonattainment for review and comment through May 22nd , 2017, no comments were received.