Environmental protection: air pollution; emergency affirmative defense provisions; repeal. Amends secs. 5506 & 5523 of 1994 PA 451 (MCL 324.5506 & 324.5523) & repeals sec. 5527 of 1994 PA 451 (MCL 324.5527).

This bill amends Michigan's Natural Resources and Environmental Protection Act to update rules regarding air pollution operating permits and removes an emergency affirmative defense provision. It establishes specific timelines for facilities to submit permit applications and compliance plans, requiring the state department to review and act on these applications within 18 months. The legislation also clarifies that a permit is not needed if a complete application was submitted on time, even if the final decision is delayed, provided the delay is not caused by the facility owner. Additionally, the bill outlines procedures for modifying permits and allows certain minor changes to a facility without needing a formal permit revision, as long as emissions limits are not exceeded.