Air Plan Approval; Maine: Prevention of Significant Deterioration; PM2.5

The Environmental Protection Agency (EPA) is proposing to approve a State Implementation Plan (SIP) revision submitted by the State of Maine relating to the regulation of fine particulate matter (that is, particles with an aerodynamic diameter less than or equal to a nominal 2.5 micrometer, generally referred to as ``PM2.5'') within the context of Maine's Prevention of Significant Deterioration (PSD) program. EPA is also proposing to approve other minor changes to Maine's PSD program. Actions related to this proposed rule are being taken in accordance with the Clean Air Act (CAA).