Air Plan Approval; Indiana; Reasonable Further Progress Plan and Other Plan Elements for the Chicago Nonattainment Area for the 2008 Ozone Standard

The Environmental Protection Agency (EPA) is approving a revision to the Indiana State Implementation Plan (SIP) to meet the base year emissions inventory, reasonable further progress (RFP), RFP contingency measure, nonattainment new source review (nonattainment NSR), volatile organic compound (VOC) reasonably available control technology (RACT), and motor vehicle inspection and maintenance (I/M) requirements of the Clean Air Act (CAA) for the Indiana portion of the Chicago-Naperville, Illinois-Indiana-Wisconsin area (Chicago area) for the 2008 ozone national ambient air quality standard (NAAQS or standard). EPA is also approving the 2017 transportation conformity motor vehicle emissions budgets (MVEBs) for the Indiana portion of the Chicago area for the 2008 ozone NAAQS. EPA is approving the state's submission as a SIP revision pursuant to section 110 and part D of the CAA and EPA's regulations because it satisfies the emission inventory, RFP, RFP contingency measure, nonattainment NSR, VOC RACT, I/M, and transportation conformity requirements for areas classified as moderate nonattainment for the 2008 ozone NAAQS. This final action permanently stops the Federal Implementation Plan (FIP) clock triggered by EPA's February 3, 2017 finding that Indiana failed to submit a marginal ozone nonattainment NSR plan. EPA proposed to approve these provisions on August 28, 2018 and received public comments.