Air Plan Approval and Air Quality Designation; New Hampshire; Redesignation of the Central New Hampshire Sulfur Dioxide Nonattainment Area

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The Environmental Protection Agency (EPA) is redesignating the Central New Hampshire nonattainment area from nonattainment to attainment for the 2010 1-hour primary sulfur dioxide (SO 2 ) national ambient air quality standard (NAAQS). EPA is also approving the maintenance plan submitted by the State of New Hampshire for the area for the SO 2 NAAQS. This nonattainment area consists of portions of Hillsborough County, Merrimack County, and Rockingham County, New Hampshire. The primary emission source in the area is now subject to federally-enforceable emission control standards, and air quality in the area now meets the SO 2 NAAQS. This action is being taken under the Clean Air Act.