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

SUMMARY

The Environmental Protection Agency (EPA) is proposing to approve 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 proposing to approve the 2017 transportation conformity motor vehicle emissions budgets (MVEBs) for the Indiana portion of the Chicago area for the 2008 ozone NAAQS. EPA is proposing to approve 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. Final approval of Indiana's SIP as meeting the nonattainment NSR requirements of the CAA for the 2008 ozone NAAQS will permanently stop the sanctions and Federal Implementation Plan (FIP) clocks triggered by EPA's February 3, 2017 finding that Indiana failed to submit a marginal ozone nonattainment NSR plan.

 
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