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

The Environmental Protection Agency (EPA) is taking direct final action to fully approve revisions to the State of Maine's State Implementation Plan (SIP) 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 taking direct final action on other minor changes to Maine's PSD program. Actions related to this direct final rulemaking are being taken in accordance with the Clean Air Act (CAA).