Approval and Promulgation of Air Quality Implementation Plans; Maryland; Redesignation Request and Associated Maintenance Plan for the Maryland Portion of the Martinsburg-Hagerstown, WV-MD Nonattainment Area for the 1997 Annual Fine Particulate Matter Standard

The Environmental Protection Agency (EPA) is approving the State of Maryland's request to redesignate to attainment the Maryland portion of the Martinsburg-Hagerstown, WV-MD Nonattainment Area (Martinsburg Area or Area) for the 1997 annual fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standard (NAAQS). The Maryland portion of the Martinsburg Area is comprised of Washington County, Maryland. EPA has found that the Martinsburg Area attained the standard and continues to attain the standard. In addition, EPA is approving, as a revision to the Maryland State Implementation Plan (SIP), the Washington County maintenance plan to show maintenance of the 1997 annual PM<INF>2.5</INF> NAAQS through 2025 for the Maryland portion of the Area. The maintenance plan includes the 2017 and 2025 PM<INF>2.5</INF> and nitrogen oxides (NO<INF>X</INF>) mobile vehicle emissions budgets (MVEBs) for Washington County, Maryland for the 1997 annual PM<INF>2.5</INF> NAAQS, which EPA is proposing to approve for transportation conformity purposes. These actions are being taken under the Clean Air Act (CAA).