NOAA approved a boundary expansion for the Narragansett Bay National Estuarine Research Reserve in Prudence Island, Rhode Island, under the CZMA.

EPA amended requirements that apply to the petroleum and natural gas systems source category of the Greenhouse Gas Reporting Rule. 

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). 

The president issued Proclamation No. 10746 of May 2, 2024, expanding the boundaries of the San Gabriel Mountains National Monument.

The president issued Proclamation No. 10745 of May 2, 2024, expanding the boundaries of the Berryessa Snow Mountain National Monument.

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. 

BLM finalized a rule that applies land health standards to all Bureau-managed public lands and uses, codifies conservation tools to be used within FLPMA's multiple-use framework, revises existing regulations concerning designation and protection of areas of critical environmental concern, and provides an overarching framework to facilitate ecosystem resilience on public lands.