Air Plan Approval; Maryland; Determination of Attainment by the Attainment Date for the 2010 1-Hour Primary Sulfur Dioxide National Ambient Air Quality Standard

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The Environmental Protection Agency (EPA) is taking final action to determine that the Anne Arundel and Baltimore County sulfur dioxide (SO 2 ) nonattainment area attained the 2010 1-hour SO 2 primary national ambient air quality standard (2010 SO 2 NAAQS) by the applicable attainment date of September 12, 2021. This determination is based on certified ambient air quality data from the 2018-2020 monitoring period, relevant modeling analysis, and additional emissions inventory information. This action addresses the EPA's obligation under Clean Air Act (CAA) section 179(c) to determine whether the Anne Arundel and Baltimore County SO 2 nonattainment area (referred to hereafter as the Anne Arundel-Baltimore County Area, or simply the Area) attained the 2010 SO 2 NAAQS by the September 12, 2021 attainment date.