Approval and Promulgation of Air Quality Implementation Plans; District of Columbia, Maryland, and Virginia; 2017 Base Year Emissions Inventories for the Washington, DC-MD-VA Nonattainment Area for the 2015 Ozone National Ambient Air Quality Standard

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The Environmental Protection Agency (EPA) is approving state implementation plan (SIP) revisions submitted by the District of Columbia (DC), State of Maryland (MD), and Commonwealth of Virginia (VA) (collectively, the States). The revisions consist of the base year inventory for the Washington, DC-MD-VA nonattainment area (the DC Area) for the 2015 ozone national ambient air quality standards (NAAQS). This action is being taken under the Clean Air Act (CAA).