EPA is taking direct final action to approve revisions to the Washoe County District Health Department (WCDHD) portion of the Nevada State Implementation Plan (SIP). These revisions concern opacity, emissions of carbon monoxide (CO) and particulate matter (PM) from wood stoves and fireplaces, and air emergency episode plans. We are approving local rules that help regulate emission sources under the Clean Air Act as amended in 1990 (CAA or the Act).