Approval and Promulgation of Air Quality Implementation Plans; Pennsylvania; Revisions To Update the 1-Hour Ozone Maintenance Plan for the Reading Area (Berks County)

EPA is approving State Implementation Plan (SIP) revisions submitted by the Commonwealth of Pennsylvania. These revisions amend Pennsylvania's ten-year plan to maintain the 1-hour ozone national ambient air quality standard (NAAQS) in the Reading area (Berks County). The maintenance plan is being amended to revise the attainment year inventories and motor vehicle emission budgets using MOBILE6. The contingency measures portion of the plan is also being amended. The intended effect of this action is to approve SIP revisions that will better enable the Commonwealth of Pennsylvania to continue to maintain attainment of the 1-hour NAAQS for ozone in the Reading area. This action is being taken under the Clean Air Act.