The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision submitted by the West Virginia Department of Environmental Protection (WVDEP) of the State of West Virginia. This revision pertains to West Virginia's plan for maintaining the 1997 8-hour ozone national ambient air quality standard (NAAQS) for the Charleston Area (comprising Kanawha and Putnam Counties). The EPA is approving these revisions to the West Virginia SIP in accordance with the requirements of the Clean Air Act (CAA).

The Environmental Protection Agency (EPA) is approving a revision to the Washington State Implementation Plan (SIP) submitted by the State of Washington on June 2, 2019, through the Washington Department of Ecology. The revision, applicable in Clark, King, Pierce, Snohomish, and Spokane Counties, Washington, removes the Inspection and Maintenance (I/M) program from the active control measure portion of the SIP.

The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision submitted by the West Virginia Department of Environmental Protection (WVDEP) on behalf of the State of West Virginia. This revision pertains to the West Virginia's plan for maintaining the 1997 8-hour ozone national ambient air quality standard (NAAQS) for the West Virginia portion of the Steubenville- Weirton, OH-WV area (Weirton Area), comprising Brooke and Hancock Counties.

The Environmental Protection Agency (EPA) is approving the State Implementation Plan (SIP) revisions submitted by Washington on February 7, 2018 as meeting certain Clean Air Act (CAA) requirements for interstate transport of the 2010 1-hour Sulfur Dioxide (SO<INF>2</INF>) National Ambient Air Quality Standards (NAAQS). The EPA has determined that emissions from Washington sources will not contribute significantly to nonattainment or interfere with the maintenance of the 2010 1-hour SO<INF>2</INF> NAAQS in any other state.