Approval and Promulgation of Air Quality Implementation Plans; Pennsylvania; Carbon Monoxide Maintenance Plan Update; Limited Maintenance Plan in Philadelphia County

EPA is taking direct final action to approve a revision to the Pennsylvania State Implementation Plan (SIP) that was submitted on March 19, 2007 by the Pennsylvania Department of the Environment. This revision is a conversion of the currently approved full maintenance plan for carbon monoxide for the years 2007-2017, to a maintenance plan that will utilize a limited maintenance plan option for the same period. This will allow Federal actions requiring conformity determinations to be considered as automatically satisfying the budget test for carbon monoxide. EPA is approving these revisions to the Philadelphia County carbon monoxide maintenance plan in accordance with the requirements of the Clean Air Act (the Act). This action is being taken under section 110 of the Act.