Approval and Promulgation of Air Quality Implementation Plans; Michigan; Infrastructure SIP Requirements for the 2008 Ozone, 2010 NO2

The Environmental Protection Agency (EPA) is proposing to approve elements of state implementation plan (SIP) submissions from Michigan regarding the infrastructure requirements of section 110 of the Clean Air Act (CAA) for the 2008 ozone, 2010 nitrogen dioxide (NO2), 2010 sulfur dioxide (SO2), and 2012 fine particulate (PM2.5) 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. EPA is also proposing to approve a submission from Michigan addressing the state board requirements under section 128 of the CAA.