The Air Pollution Control Rules have been adopted pursuant to Part 55, Air Pollution Control, of the Natural Resources and Environmental Protection Act, 1994 PA 451, as amended (Act 451).  Following are links to Part 55 and other sections of Act 451 which are pertinent to air pollution control (Michigan Legislature source):

Part 55, Air Pollution Control

Part 57, Small Business Clean Air Assistance

Part 59, Air Pollution Control Facility; Tax Exemption

Part 61, Emissions from Vessels

Part 63, Motor Vehicle Emissions Testing for West Michigan

Part 65, Motor Vehicle Emissions Testing for Southeast Michigan