EPA is taking direct final action to convert its conditional approval of a revision to the Maryland State Implementation Plan (SIP) to a full approval. The revision consists of the 15 percent rate of progress requirements for the Baltimore severe ozone nonattainment area. EPA is also taking direct final action to approve revisions to certain portions of the 1990 base year emissions inventory of volatile organic compound (VOC) and nitrogen oxide (NO<INF>x</INF>) emissions for the Baltimore nonattainment area. EPA is approving these revisions in accordance with the requirements of the Clean Air Act.