Wisconsin; Disapproval of Infrastructure SIP With Respect to Oxides of Nitrogen as a Precursor to Ozone Provisions for the 2006 PM2.5

The Environmental Protection Agency (EPA) is proposing to disapprove an element of State Implementation Plan (SIP) submissions from Wisconsin regarding the infrastructure requirements of section 110 of the Clean Air Act (CAA) for the 2006 fine particulate matter (PM 2.5 ) National Ambient Air Quality Standard (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. This action pertains specifically to an infrastructure requirement for states to correctly address oxides of nitrogen (NO X ) as a precursor to ozone in their respective prevention of significant deterioration (PSD) programs.