Air Plan Approval; Michigan and Wisconsin; 2006 PM2.5

The Environmental Protection Agency (EPA) is approving elements of state implementation plan (SIP) submissions from Michigan regarding Prevention of Significant Deterioration (PSD) and Wisconsin regarding visibility infrastructure requirements of section 110 of the Clean Air Act (CAA) for the 2006 fine particulate matter (PM 2.5 ) National Ambient Air Quality Standards (NAAQS). The infrastructure requirements are designed to ensure that the structural components of each state's air quality management program are adequate to meet the state's responsibilities under the CAA.