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In April 2012, EPA issued the final Mercury and Air Toxics Standards (MATS) Rule. EPA received petitions for reconsideration of this final rule. In November 2012, EPA granted reconsideration on proposed revisions to and solicited comment on four issues raised in the petitions: certain revised new source standards in MATS, requirements applicable during periods of startup and shutdown in MATS, startup and shutdown provisions related to the Particulate Matter (PM) standard in the Utility NSPS, and definitional and monitoring provisions in the Utility NSPS. In April 2013, EPA finalized the revisions to the new source standards. The petitions for reconsideration related to the startup/shutdown provisions indicated that the public lacked an opportunity to comment on these provisions. In November 2012, EPA granted reconsideration to provide an opportunity for public comment on this issue (NPRM 2). In June 2013, EPA reopened the public comment period for the proposed reconsideration of the startup/shutdown issues. After review of the public comments received, with this action, EPA issued a final rule announcing our final decision on the proposed startup/shutdown reconsideration.