Approval and Promulgation of Air Quality Implementation Plans; Maine; Ozone Maintenance Plans

The EPA is approving a State Implementation Plan (SIP) revision submitted by the State of Maine, that includes four separate 8-hour ozone maintenance plans. The Clean Air Act requires that areas that are designated attainment for the 8-hour ozone standard, and also had been previously designated either nonattainment or maintenance for the 1-hour ozone standard, develop a plan showing how the state will maintain the ozone standard for the area. Maine's maintenance plans include an emissions inventory, a plan for how the state will demonstrate and track progress of continued maintenance of the standard, a commitment to continue ozone monitoring, and a contingency plan that will ensure that any violation of the 8-hour ozone standard is promptly addressed. The intended effect of this action is to approve these four maintenance plans into the Maine SIP. This action is being taken under the Clean Air Act.