Environmental Planning

Air Quality Planning


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 Multimodal Planning Division 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). NOTE: MPD Air Quality is currently in the process of updating these consultation procedures and process.

MPOs' Conformity Documents
2013 Conformity Finding Letters
2011 Conformity Finding Letters
2010 Conformity Finding Letters
2009 Conformity Finding Letters
2009 Conformity Finding Letters
2007 Conformity Finding Letters
Interagency Consultation Meetings