The EPA is finalizing approval of revisions to the Texas State Implementation Plan (SIP). We are approving the rules in 30 TAC Chapter 117 that the State submitted on May 30, 2007, concerning control of emissions of NO<INF>X</INF> from cement kilns operating in Bexar, Comal, Ellis, Hays, and McLennan Counties. We are approving the nonsubstantive renumbering of the rules for all five counties. We also are approving the substantive changes to the rules for Ellis County, based on a determination that the rules for Ellis County meet the NO<INF>X</INF> Reasonably Available Control Technology (RACT) requirements for cement kilns operating in the Dallas Fort Worth (D/FW) 1997 8-hour ozone nonattainment area. We are taking this action under section 110 and part D of the Federal Clean Air Act (the Act, or CAA).