Approval and Promulgation of Air Quality Implementation Plans; District of Columbia; Regional Haze State Implementation Plan for the Second Implementation Period and Reasonably Available Control Technology for Major Stationary Sources of Nitrogen Oxides; Technical Amendment

The Environmental Protection Agency (EPA) is approving a regional haze state implementation plan (SIP) revision submitted by the District of Columbia ("the District" or "DC") through the Department of Energy and Environment (DOEE) on November 8, 2019, as satisfying applicable requirements under the Clean Air Act (CAA) and EPA's Regional Haze Rule (RHR) for the program's second implementation period. The District's SIP submission addressed the requirement that states must periodically revise their long-term strategies for making reasonable progress towards the national goal of preventing any future, and remedying any existing, anthropogenic impairment of visibility in mandatory Class I Federal Areas, including regional haze. EPA is taking this action pursuant to sections 110 and 169A of the CAA. EPA is also correcting an error in the citations in our previous final approval of the District's revision to the Reasonably Available Control Technology for Major Stationary Sources of Nitrogen Oxides Rule ("DC NOx RACT rule") according to our authority under section 110(k)(6) of the CAA.