Indian Country: Air Quality Planning and Management; Federal Implementation Plan for the Kalispel Indian Community of the Kalispel Reservation, Washington; Redesignation to a PSD Class I Area

In this final rule, the Environmental Protection Agency (EPA) is approving the May 11, 2017 proposal by the Kalispel Indian Community of the Kalispel Reservation (herein referred to as the Kalispel Tribe of Indians or Kalispel Tribe) to redesignate lands within the exterior boundaries of the Kalispel Indian Reservation located in the State of Washington to Class I under the Clean Air Act (Act or CAA) program for the prevention of significant deterioration (PSD) of air quality. Redesignation to Class I will result in lowering the allowable increases in ambient concentrations of particulate matter (PM), sulfur dioxide (SO<INF>2</INF>), and nitrogen oxides (NO<INF>X</INF>) on the Kalispel Indian Reservation. Concurrently, the EPA is codifying the redesignation through a revision to the Federal Implementation Plan (FIP) currently in place for the Kalispel Indian Reservation. This FIP will be implemented by the EPA unless or until it is replaced by a Tribal Implementation Plan (TIP).