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Regulations
Transportation
Conformity
- Main Transportation Conformity Page
- General Information
- Policy Guidance
- Training Materials
- Regulations
- Adequacy Review of SIP Submissions
- Regional Contacts
NOTE: You will need Adobe Acrobat Reader, available as a free download, to view some of the files on this page. See EPA's PDF page to learn more about PDF, and for a link to the free Acrobat Reader.
This page provides access to all transportation conformity regulations, including final rules and rulemakings currently in progress. It also provides access to guidance documents that have been issued to facilitate implementation of the conformity program.
Notice of Proposed Rulemaking: MOVES Regional Grace Period Extension
This proposed rule would extend the grace period before the MOtor Vehicle Emission Simulator model (currently MOVES2010a) is required for regional emissions analyses for transportation conformity determinations (“regional conformity analyses”). This proposal, if finalized, would provide an additional year to the previously established two-year conformity grace period.- Proposed Rule (PDF) (7pp, published October 13, 2011)
On December 5, 2011, EPA withdrew the parallel direct final rule which was also published October 13, 2011 (76 FR 63554) due to an adverse comment.
Proposed Rule: Transportation Conformity Rule Restructuring Amendments
This proposal would primarily restructure several sections of the transportation conformity rule so that they would apply for any new or revised NAAQS that are established.- Proposed Rule (PDF) (13 pp, 119K, published August 13, 2010)
- Comparison of Proposed Transportation Conformity Rule Restructuring Amendments versus Existing Conformity Rule (PDF) (EPA-420-F-10-044, 6 pp, 99K, August 2010)
- Fact Sheet (PDF) (EPA-420-F-10-001, 3pp, 14K, August 2010)
Current Laws and Regulations
- Clean Air Act - Conformity Section (PDF) (8 pp, 107K) This document includes Clean Air Act Section 176(c) as amended by the 2005 transportation act known as “SAFETEA-LU". EPA is providing this document for informational purposes only.
- Transportation Conformity Regulations (PDF) (50 pp, 296K, EPA-420-B-10-006) This document reflects all transportation conformity rulemakings promulgated by EPA as of March 24, 2010, including the PM Amendments final rule.
- Baseline Year for the Baseline Year Test (in 40 CFR 93.119) Refer to this page for a table showing the baseline year to be used for each NAAQS and the regulatory provision where it is found.
- Chronological List of Transportation Conformity Rulemakings EPA has published rule amendments in the Federal Register since transportation conformity was enacted as part of the 1990 Clean Air Act. These rulemakings include preamble text explaining rule provisions that remain in effect today.
- Policy Guidance EPA and the U.S. Department of Transportation have issued a number of guidance documents that provide additional information on implementing the conformity regulations.
For more information, contact Meg Patulski at 734-214-4842 or patulski.meg@epa.gov.