The Environmental Protection Agency is approving a State Implementation Plan (SIP) revision for Olmsted County, Minnesota, for the control of sulfur dioxide (SO<INF>2</INF>) emissions in the city of Rochester. EPA is also approving a request to redesignate the Rochester nonattainment area to attainment of the SO<INF>2</INF> National Ambient Air Quality Standards (NAAQS). In conjunction with these actions, EPA is also approving the maintenance plan for the city of Rochester, Olmsted County nonattainment area, which was submitted to ensure that attainment of the NAAQS will be maintained. The SIP revision, redesignation request and maintenance plan were submitted by the Minnesota Pollution Control Agency (MPCA) on November 4, 1998, and are approvable because they satisfy the requirements of the Clean Air Act (Act). The rationale for the approval and other information are provided in this notice.