EPA is taking several actions on a revision to the Minnesota State Implementation Plan (SIP) which updates Minnesota's rules in the SIP. The Minnesota Pollution Control Agency (MPCA) submitted the SIP revision to EPA on May 5, 2008. The revisions to Minnesota's air quality rules reflect changes that have occurred to the state rules since 1998. EPA is approving the majority of MPCA's submittal, which will result in consistent enforceability of rules at the state and Federal levels. EPA is deferring action on two sections of Minnesota's rules related to the state's operating permit program. Finally, EPA is disapproving the state's request to remove the Minneapolis/St. Paul vehicle inspection and maintenance program from the Minnesota SIP. These actions are consistent with the Clean Air Act (CAA) and EPA regulations.