Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; Kentucky; Redesignation of the Kentucky Portion of the Cincinnati-Hamilton 1997 8-Hour Ozone Nonattainment Area to Attainment

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On January 29, 2010, the Commonwealth of Kentucky, through the Kentucky Energy and Environment Cabinet, Division for Air Quality (DAQ), submitted a request to redesignate the Kentucky portion of the tri-state Cincinnati-Hamilton 8-hour ozone nonattainment area (the "tri-state Cincinnati-Hamilton Area") to attainment for the 1997 8- hour ozone national ambient air quality standards (NAAQS); and to approve the state implementation plan (SIP) revision containing a maintenance plan for the Kentucky portion of the tri-state Cincinnati- Hamilton Area. The tri-state Cincinnati-Hamilton 1997 8-hour ozone nonattainment area is composed of Boone, Campbell and Kenton Counties in Kentucky (hereafter also referred to as "Northern Kentucky"); Butler, Clermont, Clinton, Hamilton and Warren Counties in Ohio; and a portion of Dearborn County in Indiana. In this action, EPA is proposing to: Determine that the tri-state Cincinnati-Hamilton Area has attained the 1997 8-hour ozone NAAQS; approve Kentucky's redesignation request for Boone, Campbell and Kenton Counties in Kentucky as part of the tri- state Cincinnati Area; approve the 1997 8-hour ozone maintenance plan for Northern Kentucky, including th