Approval of Maintenance Plan and Designation of Areas for Air Quality Planning Purposes; Minnesota

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USEPA is approving a redesignation request and maintenance plan for the City of Duluth as a revision to Minnesota's State Implementation Plan (SIP) for carbon monoxide. The revision is based on a request from the State of Minnesota to redesignate this area, and approve its maintenance plan, and on the supporting data the State submitted. Under the Clean Air Act, designations can be changed if sufficient data are available to warrant such change.