The EPA is taking a direct final action to approve revisions to the Texas State Implementation Plan (SIP). We are approving revisions to 30 TAC Chapter 117, "Control of Air Pollution from Nitrogen Compounds," that the State submitted on March 10, 2009. These revisions amend the Beaumont-Port Arthur (BPA) 8-Hour Ozone Nonattainment Area Major Source rules, the Houston-Galveston-Brazoria (HGB) 8-Hour Ozone Nonattainment Area Major Source rules, and the HGB 8-Hour Ozone Nonattainment Area Minor Source rules. These revisions add flexibility and consistency to the current stationary reciprocating internal combustion engine and gas turbine monitoring specifications found in Chapter 117 by allowing for an additional option for monitoring nitrogen oxides (NO<INF>X</INF>) emissions. These revisions are consistent with the Clean Air Act (CAA). Therefore, EPA is approving these revisions pursuant to section 110 of the CAA.