Air Plan Approval; Indiana; Infrastructure SIP Requirements for the 2012 PM2.5

The Environmental Protection Agency (EPA) is approving elements of a state implementation plan (SIP) submission from Indiana regarding the infrastructure requirements of section 110 of the Clean Air Act (CAA) for the 2012 fine particulate matter (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 proposed this action on August 31, 2017, and received one public comment in response.