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

The Environmental Protection Agency (EPA) is disapproving an August 15, 2016 request from Wisconsin to redesignate the Wisconsin portion of the Chicago-Naperville, Illinois-Indiana-Wisconsin (IL-IN- WI) ozone nonattainment area (Chicago nonattainment area) to attainment of the 2008 ozone National Ambient Air Quality Standard (NAAQS or standard), because the area is violating the standard with 2015-2017 monitoring data. EPA is also disapproving Wisconsin's maintenance plan and Motor Vehicle Emissions Budgets (MVEBs), submitted with the State's redesignation request, since approval of these State Implementation Plan (SIP) components is contingent on attainment of the ozone standard. The Chicago area includes Cook, DuPage, Kane, Lake, McHenry and Will Counties, Aux Sable and Goose Lake Townships in Grundy County, and Oswego Township in Kendall County in Illinois; Lake and Porter Counties in Indiana; and the area east of and including the corridor of Interstate 94 in Kenosha County, Wisconsin.