The U.S. EPA is reviewing the Milwaukee nonattainment designation and may change the status from “moderate” to “serious.” This change is expected to occur in the spring of 2025 but may occur as early as the fall of 2024. The re-classification has a direct impact on construction and operating air permitting programs.
Title V of the Clean Air Act requires major sources of air pollutants and certain other sources to obtain and operate in compliance with an operating permit. With the impending change applicable to the greater Milwaukee metropolitan area from moderate to serious nonattainment for ozone, the Title V threshold for NOx and VOC emissions will decrease, meaning more companies will be subject to Title V permitting. A source can still accept a voluntary limit on its potential to emit and apply for a Federally Enforceable State Operating Permit (FESOP).
Additional Resources Nonattainment Designation: