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Adequacy Status of Motor Vehicle Emissions Budgets for Four Areas in Michigan for Transportation Conformity Purposes

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Environmental Protection Agency (EPA).


Notice of adequacy.


In this action, EPA is notifying the public that EPA has found that the motor vehicle emissions budgets (MVEBs) for four areas across the state of Michigan are adequate for conformity purposes. On March 2, 1999, the D.C. Circuit Court ruled that submitted State Implementation Plans (SIPs) cannot be used for conformity determinations until EPA has affirmatively found them adequate. As a result of our finding, the Flint (consisting of Genesee and Lapeer Counties), Muskegon County, Berrien County, and Cass County areas can use the (MVEBs) for future conformity determinations. These budgets are effective February 7, 2007. The finding and the response to comments will be available at EPA's conformity Web site:​otaq/​transp.htm, (once there, click on the “Conformity” button, then look for “Adequacy Review of SIP Submissions for Conformity”).

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Anthony Maietta, Life Scientist, Criteria Pollutant Section (AR-18J), Air Programs Branch, Air and Radiation Division, United States Environmental Protection Agency, Region 5, 77 West Jackson Boulevard, Chicago, Illinois 60604, (312) 353-8777,

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Throughout this document, whenever “we”, “us” or “our” is used, we mean EPA.


Today's action is simply an announcement of a finding that we have already made. EPA Region 5 sent a letter to the Michigan Department of Environmental Quality on November 29, 2006, stating that the 2018 (MVEBs) in the Flint, Muskegon County, Berrien County, and Cass County areas are adequate. Michigan submitted the budgets as part of the 8-hour ozone redesignation requests and maintenance plans for these areas. This finding was announced on EPA's conformity Web site, and received no comments:​otaq/​stateresources/​transconf/​adequacy.htm, (once there, click on “What SIP submissions are currently under EPA adequacy review?”).

The 2018 (MVEBs), in tons per day, for volatile organic compounds and oxides of nitrogen for these areas are as follows:

Area2018 VOC MVEB (tpd)2018 NOX MVEB (tpd)
Muskegon County6.6711.00
Berrien County9.1615.19
Cass County2.763.40

Transportation conformity is required by section 176(c) of the Clean Air Act. EPA's conformity rule requires that transportation plans, programs, and projects conform to state air quality implementation plans and establishes the criteria and procedures for determining whether or not they do. Conformity to a SIP means that transportation activities will not produce new air quality violations, worsen existing violations, or delay timely attainment of the national ambient air quality standards.

The criteria by which we determine whether a SIP's motor vehicle emission budgets are adequate for conformity purposes are outlined in 40 CFR 93.118(e)(4). Please note that an adequacy review is separate from EPA's completeness review, and it also should not be used to prejudge EPA's ultimate approval of the SIP. Even if we find a budget adequate, the SIP could later be disapproved.

We've described our process for determining the adequacy of submitted SIP budgets in guidance (May 14, 1999 memo titled “Conformity Guidance on Implementation of March 2, 1999 Conformity Court Decision”). We followed this guidance in making our adequacy determination.

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Dated: January 11, 2007.

Mary A. Gade,

Regional Administrator, Region 5.

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[FR Doc. E7-919 Filed 1-22-07; 8:45 am]