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 Hot-Spot Analysis

Completed Projects are listed below, documents can be requested through [email protected] Level Hot-Spot modeling and associated consultation documents required for hot-spot modeling will be posted here as applicable.

F0719 SR24, SR202L (Santan) – Ironwood FHWA, Approved January 13th, 2026
T0428 El Mirage Road SR303L – Jomax Road, FHWA Approved November 28th, 2025
F0562 & F0561 SR 303L Lake Pleasant Parkway to Interstate 17, ADOT Approved: April 7th, 2025
T0359 Elliot Road: Eastern Maricopa Floodway to Ellsworth Road, FHWA Approved November 4, 2024
F0124 State Route 202L (Santan Freeway) from Val Vista to Interstate 10, FHWA Approved December 13, 2023
F0123 SR 101, Princess Dr to Shea Blvd, FHWA Approved August 7, 2023
T0239 Happy Valley Road: 67th Avenue to 35th Avenue, ADOT approved September 22, 2022
F0072 I-10, I-17 (Split) to SR2020L (Santan), FHWA Approved April 22, 2020
F0316 SR 101L, 75th Ave to I-17: Adding General Purpose Lanes & 75th Ave TI Improvements, ADOT approved December 2, 2021
F0316 SR 101L, 75th Ave to I-17: Ramp WN Improvements, October 11, 2023.

Project Level Conformity Consultation

Completed Project Level Project and interagency consultation documents without modeling will be posted here as applicable.

T0530 Casa Grande, Thornton Rd Widening, ADOT approved June 9, 2025
F0701 I-10: Koli Road Traffic Interchange Study, FHWA approved September 19, 2025
F0608 US 95, Wellton-Mohawk Canal to Imperial Dam Road, FHWA approved November 6, 2024
F0605 US 95: Imperial Dam Rd. to Aberdeen Rd, FHWA approved August 27, 2024
SS976 Ave E/D Extension: Co. 23rd St. to Co. 16th St. FHWA approved August 1, 2024
T0499 Pima Road; Happy Valley Road to Jomax Road, Scottsdale, ADOT approved May 31, 2024
F0486 I-10 Jackrabbit Trail Traffic Interchange (TI), FHWA approved May 15, 2024.
T0335 Warner Rd: Recker Rd to Power Rd. FHWA approved April 3, 2024
F0252 Interstate 10; SR 202L to SR 387, FHWA approved October 19, 2023
F0475 SR 101 at I-10 System TI Improvements, FHWA approved July 20, 2023
F0424 SR 303L, 51st and 43rd Ave. Traffic Interchanges, FHWA approved December 2, 2021
F0359 US-95, Rifle Range Rd. to Wellton-Mohawk Canal. FHWA approved October 19, 2021
H6800 I-17, Anthem Way to Jct. SR 69 (Cordes Junction), FHWA approved April 6, 2021
T0227 Signal Butte Road Improvements (Mesa), FHWA approved February 22, 2021
F0233 I-10, Avondale Blvd to I-17, ADOT approved January 11, 2021
T0164 I-10, Kortsen Road Traffic Interchange, FHWA approved March 5, 2020
F0166 I-17, Indian School Traffic Interchange, FHWA approved June 18,2019.
F0119 I-10, SR85 to Verrado Way, FHWA approved April 30th, 2019
T0203 Chandler Heights Road: Gilbert Road to Val Vista Drive, ADOT approved March 7, 2019
T0103 Ocotillo Road: Gilbert Road to 148th Street, ADOT approved July 13, 2018
H7383 I-17: Pinnacle Peak Road TI and Happy Valley Road TI, ADOT approved February 22, 2018
SZ181 Cooper Road: Riggs Road to Alamosa, FHWA approved February 5, 2019

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.

Douglas International Commercial Port-of-Entry Connector Road Study

The Arizona Department of Transportation, in coordination with the Federal Highway Administration, US General Services Administration (GSA), the city of Douglas and Cochise County, is evaluating alternatives for a connector road from the new Douglas International Port of Entry (IPOE) to State Route 80. ADOT is currently developing a regional and project level conformity analysis for this project located in the Paul Spur/Douglas | PM-10 Nonattainment Area. ADOT requested comments on the draft documents provided through the Environmental Assessment on the Project Page. A public hearing was held Nov. 19 to provide an overview of the draft Environmental Assessment and the Design Concept Report (DCR), share ADOT’s recommended alternative for a connector road and receive public comments. Public comments were accepted through Dec. 9, 2024, through the online comment form, mail, telephone and email. (Refer to Appendix A Air Quality)

F0534 Final Air Quality Regional Conformity Analysis,City of Douglas New Commercial Land Port of Entry (LPOE) Connector Road Study, FHWA approval January 15, 2025
F0534 Final Air Quality Project Level Conformity Analysis, City of Douglas New Commercial Land Port of Entry (LPOE) Connector Road Study,FHWA approval January 15, 2025

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.

H8045 Final Air Quality Regional Conformity Analysis, State Route 189 Study: International Border to Grand Avenue project
H8045 Final Air Quality Project Level Conformity Analysis, State Route 189 Study: International Border to Grand Avenue project