Michigan regulators propose housekeeping updates to Part 10 stack‑testing rules

The Department of Environment, Great Lakes and Energy on Thursday told the Joint Committee on Administrative Rules that proposed updates to Part 10 of Michigan’s Air Pollution Control Rules are largely administrative and meant to align state rules with federal standards.

Sydney Hart, legislative liaison for the Department of Environment, Great Lakes and Energy, said the package clarifies how intermittent testing and sampling are conducted and updates references to technical guidance. "The changes before you today are largely administrative and clarifying," Hart said. "While modest, they are important for aligning our rules with current testing protocols and federal Clean Air Act requirements."

The department described Part 10 as the portion of Michigan’s air rules that governs intermittent stack testing and sampling and said those procedures are…