EPA is approving a Tribal Implementation Plan (TIP) submitted by the Mohegan Tribe of Indians of Connecticut. The TIP establishes an enforceable cap on nitrogen oxide emissions from stationary sources owned by the Mohegan Tribal Gaming Authority and located within the external boundaries of the Mohegan Reservation. This action is intended to help attain the National Ambient Air Quality Standards (NAAQS) for ground-level ozone. This action is being taken in accordance with the Clean Air Act.