In this document, EPA is approving an October 12, 1995 request from the designee of the Governor of South Dakota to redesignate the ``Rest of State'' area designated under section 107 of the Clean Air Act (Act), which includes the entire State of South Dakota except the Rapid City area, from unclassifiable to attainment for PM-10. EPA is approving the redesignation request because the State has adequately demonstrated that the ``Rest of State'' is in attainment of the PM-10 National Ambient Air Quality Standards (NAAQS) and that it will continue to maintain the PM-10 NAAQS. The requirements that will apply in the ``Rest of State'' area will not change as a result of this action because, for the purposes of the requirements of the Act, unclassifiable areas and attainment areas are treated the same.