Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes: Washington; Yakima PM-10 Nonattainment Area Limited Maintenance Plan

The Environmental Protection Agency (EPA or Agency) is taking final action to approve the Limited Maintenance Plan (LMP) for Yakima PM-10 nonattainment area (Yakima NAA) in the State of Washington and grant a request by the State to redesignate the Yakima NAA to attainment for the National Ambient Air Quality Standards (NAAQS) for particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers (PM-10). In a concurrent notice of final rulemaking published today, EPA is correcting the boundary of the Yakima NAA to exclude a small portion that lies within the exterior boundary of the Yakama Indian Reservation. The State Implementation Plan (SIP) that we are approving with this action does not extend to lands which are within the boundaries of the Yakama Indian Reservation.