Air Plan Approval; Wisconsin; Moderate Attainment Plan Elements for Wisconsin's 2015 Ozone Standard Areas

The U.S. Environmental Protection Agency (EPA) is approving portions of Wisconsin's 2015 ozone National Ambient Air Quality Standard (NAAQS or standard) Moderate nonattainment area State Implementation Plan (SIP) submission for the Wisconsin portion of the Chicago, Illinois-Indiana-Wisconsin area (Kenosha County), the Milwaukee, Wisconsin area, and the Sheboygan County, Wisconsin area. The elements of the Moderate SIP submissions include the reasonable further progress (RFP) demonstration and the associated motor vehicle emissions budgets (Budgets) for 2023, the motor vehicle inspection and maintenance (I/M) program, and the nonattainment new source review (NNSR) program. The EPA is also approving the base year emissions inventory as satisfying previous Marginal area requirements for these areas. The EPA is finding adequate and approving the Budgets for these areas. The EPA proposed to approve this action on April 2, 2026, and received no adverse comments.