The Environmental Protection Agency (EPA) is finalizing its proposal to approve revisions to the Texas State Implementation Plan (SIP) for the control of Air Pollution from Nitrogen Compounds. Specifically, we are approving three separate revisions that were submitted to EPA with letters dated April 13, 2012, May 8, 2013, and May 14, 2013, respectively. We are approving these three submittals in accordance with the federal Clean Air Act (the Act, CAA).