Note: This document was superseded on November, 2008.

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Note: this guidance was superseded November 2008.

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U.S. Department of Transportation
Federal Highway Administration

Subject: New Guidance on CMAQ and Revocation of the 1-Hour Ozone Standard

James M. Shrouds
Director, Office of Natural and Human Environment

The Attention of Division Planning and Air Quality Staff

Date: Date: December 21, 2004

Reply to:

The purpose of this e-mail is to forward new guidance on CMAQ and revocation of the 1-hour ozone standard.

Previous guidance allowed areas to update their Transportation Improvement Programs (TIPs) for a period of 4-months after the revocation of the 1-hour ozone standard. This guidance rescinds that provision. These areas may use the time up to the date of revocation (anticipated on June 15, 2005) to make any adjustments they feel are necessary to their TIPs. As noted in the attached memo, nonattainment and maintenance areas that have their 1-hour ozone standard revoked may continue to fund the CMAQ projects directed at meeting the 1-hour standard included in the first 3 years of the TIP that is in existence at the time of the revocation. After the date of revocation, such projects may not be added to the TIP.

If you have any questions, please contact Mike Koontz at 202-366-2076 or, or Rob Kafalenos at 202-366-2079 or

Updated: 6/28/2017
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