NOAA approved a boundary expansion for the South Slough National Estuarine Research Reserve in Charleston, Oregon. 

EPA finalized the residual risk and technology review conducted for NESHAPs for the primary copper smelting major source category. 

SIP Approval: Kentucky (updates to definitions rule and certain incorporation by reference dates for the Louisville Metro Air Pollution Control District). 

SIP Approval: Tennessee (revisions to continuous opacity monitoring system requirements). 

EPA finalized multiple actions under §111 of the CAA addressing greenhouse gas (GHG) emissions from fossil fuel-fired electric generating units (EGUs), including the repeal of the Affordable Clean Energy Rule, emission guidelines for GHG emissions from existing fossil fuel-fired steam generating EGUs, and revisions to the new source performance standards for GHG emissions from new and reconstructed fossil fuel-fired stationary combustion turbine EGUs. 

EPA finalized a CWA regulation to revise the technology-based effluent limitations guidelines and standards for the steam electric power generating point source category applicable to flue gas desulfurization wastewater, bottom ash transport water and legacy wastewater at existing sources, and combustion residual leachate at new and existing sources. 

EPA finalized technology reviews conducted for NESHAPs for gasoline distribution facilities and the review of new source performance standards for bulk gasoline terminals.