Air Plan Approval; Wisconsin; Reasonable Further Progress Plan and Other Plan Elements for the Moderate Nonattainment Chicago Area for the 2008 Ozone Standards

The Environmental Protection Agency (EPA) is finalizing approval of a revision to the Wisconsin State Implementation Plan (SIP) to meet the base year emissions inventory, reasonable further progress (RFP), RFP contingency measure, nitrogen oxides (NO<INF>X</INF>) reasonably available control technology (RACT), and motor vehicle inspection and maintenance (I/M) requirements of the Clean Air Act (CAA) for the Wisconsin portion of the Chicago-Naperville, Illinois- Indiana-Wisconsin nonattainment area (Chicago area) for the 2008 ozone National Ambient Air Quality Standards (NAAQS or standards). EPA is also finalizing approval of the 2017 and 2018 transportation conformity motor vehicle emissions budgets (MVEBs) for the Wisconsin portion of the Chicago area for the 2008 ozone NAAQS. EPA proposed approval of these attainment planning elements on August 16, 2018, and received no adverse comments germane to this action. Therefore, EPA is finalizing approval of this 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, NO<INF>X</INF> RACT, I/M, and transportation conformity requirements for the Wisconsin portion of the Chicago area, which is classified as moderate nonattainment for the 2008 ozone NAAQS.