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Inspection & Maintenance (I/M) - Policy Guidance

This page provides policy guidance on I/M program implementation.

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.

  • February 2014 modeling guidance document entitled Performance Standard Modeling for New and Existing Vehicle Inspection and Maintenance (I/M) Programs Using the MOVES Mobile Source Emissions Model (PDF) (25 pp, 246K, EPA-420-B-14-006, January 2014) provides clarification on how to quantify I/M emission reductions for planning purposes using the MOVES generation of mobile source emission factor models, including a discussion of I/M modeling changes since the previous mobile source emission factor model, MOBILE. This guidance corrects technical issues identified in an earlier version released November 2013 (23 pp, 242K, EPA-420-B-13-059, November, 2013).  The current version replaces that earlier document.

  • May 12, 2004 policy memo signed by Tom Helms (Ozone Policy and Strategies Group) and Leila Cook (State Measures and Conformity Group) entitled 1-Hour Ozone Maintenance Plans Containing Basic I/M Programs (PDF) (3 pp, 92K) provides clarification on how the CAA's anti-backsliding provisions apply under the 8-hour standard with regard to certain categories of vehicle inspection and maintenance (I/M) programs.

  • October 3, 2002 Guidance Memo (PDF) (1 pg, 52K) and Attachment (PDF) (5 pp, 272K), signed by Margo Oge, entitled "Considerations for State I/M Program Optimization" provides a list of questions and/or issues states should consider as they make choices about their existing and/or future I/M programs.

  • EPA guidance on Model Year Exemption Policy (PDF) (2 pp, 9K, EPA420-S-99-007, December, 1999)

  • The Calculation of I/M Waiver Adjusted for CPI (PDF) (2 pp, 8K, EPA420-B-99-011, December 1999) is the methodology that states should use to determine the minimum repair expenditure limit for waiver under 51.360 of the I/M rule.

Contact: Dave Sosnowski at 734-214-4823 or dave.sosnowski@epa.gov

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