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 Annual Fine Particulate Matter Nonattainment Area to Attainment

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On January 27, 2011, the Commonwealth of Kentucky, through the Kentucky Energy and Environment Cabinet, Division of Air Quality (DAQ), submitted a request to redesignate the Kentucky portion of the Cincinnati-Hamilton, Ohio-Kentucky-Indiana (hereafter referred to the "Tri-state Cincinnati-Hamilton Area") fine particulate matter (PM 2.5 ) nonattainment area to attainment for the 1997 Annual PM 2.5 National Ambient Air Quality Standards (NAAQS); and to approve a 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 Area is comprised of Boone, Campbell, and Kenton Counties in Kentucky (hereafter referred to as the "Northern Kentucky Area" or "Area"); Butler, Clermont, Hamilton, and Warren Counties in Ohio; and a portion of Dearborn County in Indiana. EPA is proposing to approve the redesignation request for Boone, Campbell, and Kenton Counties, along with the related SIP revision, including the Commonwealth's plan for maintaining attainment of the PM 2.5 standard in the Northern Kentucky Area. EPA is also proposing to approve Kentucky's nitrogen oxides (NO X ) and PM