Air Plan Approval; Illinois; Redesignation of the Illinois Portion of the Chicago-Naperville, Illinois-Indiana-Wisconsin Area to Attainment of the 2008 Ozone Standard

The Environmental Protection Agency (EPA) finds that the Illinois portion of the Chicago-Naperville, IL-IN-WI area (Chicago area) is attaining the 2008 ozone National Ambient Air Quality Standard (NAAQS or standard) and is acting in accordance with a January 25, 2022, request from Illinois to redesignate the Illinois portion of the Chicago area to attainment for the 2008 ozone NAAQS because the request meets the statutory requirements for redesignation under the Clean Air Act (CAA). EPA is approving, as a revision to the Illinois State Implementation Plan (SIP), the State's plan for maintaining the 2008 ozone NAAQS through 2035 in the Illinois portion of the Chicago area. EPA finds adequate and is approving the 2035 volatile organic compound (VOC) and oxides of nitrogen (NO<INF>X</INF>) motor vehicle emission budgets (budgets) for transportation conformity purposes for the Illinois portion of the Chicago area. Pursuant to section 110 and part D of the CAA, EPA is approving the VOC reasonably available control technology (RACT), Enhanced motor vehicle inspection and maintenance (I/M), clean-fuel vehicle programs (CFVP), and the enhanced monitoring of ozone and ozone precursors (EMP) SIP revisions submitted by Illinois, because they satisfy serious SIP requirements of the CAA for the Illinois portion of the Chicago area. Finally, EPA is approving a CAA section 182(f) waiver from NO<INF>X</INF> RACT requirements for the Illinois portion of the Chicago area under the 2008 ozone NAAQS.