Approval and Promulgation of Air Quality Implementation Plans; Michigan; SO2

The Environmental Protection Agency (EPA) is proposing to approve a request by the Michigan Department of Environmental Quality (MDEQ) submitted on February 14, 2014, and supplemented on October 27, 2014, to revise the Michigan state implementation plan (SIP) to incorporate sulfur dioxide (SO2) limits found in ``Part 4: Emissions Limitations and Prohibitions--Sulfur Bearing Compounds'' of Michigan's Air Pollution Control Rules. EPA is proposing to take no action on the provisions pertaining to the Federal Clean Air Interstate Rule (CAIR) SO2 trading program because CAIR is no longer in effect.