St. Clair County Michigan 2010 SO2 Redesignation Maintenance Plan 2023
Summary
EPA finalized the St. Clair County Michigan 2010 SO2 Redesignation Maintenance Plan for 2023. The plan establishes how the area will maintain sulfur dioxide air quality standards following redesignation from nonattainment to attainment status under the Clean Air Act. Affected facilities in St. Clair County must continue monitoring and complying with SO2 emissions requirements under the approved maintenance plan.
What changed
EPA approved Michigan's SO2 redesignation maintenance plan for St. Clair County, establishing the framework for maintaining air quality standards following the area's redesignation from nonattainment to attainment. The plan sets forth monitoring and compliance obligations for facilities subject to Clean Air Act SO2 requirements.
Facilities in St. Clair County previously subject to nonattainment area requirements now operate under maintenance area provisions. Affected industrial sources and energy companies must ensure ongoing compliance with the approved maintenance plan to support continued attainment of SO2 air quality standards.
What to do next
- Review maintenance plan requirements for affected facilities
- Continue SO2 emissions monitoring per approved plan
- Ensure compliance with maintenance area obligations
Archived snapshot
Apr 11, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
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