EPA lowered the level of the primary annual fine particulate matter standard and finalized other key aspects related to the particulate matter NAAQS. 

EPA finalized maximum achievable control technology standards for mercury and revised emission standards for hydrogen chloride and hydrogen fluoride for NESHAPs for taconite iron ore processing. 

EPA entered into a proposed consent decree in Our Children’s Earth Foundation v. Regan, No. 3:23-cv-04955-WHA (N.D. Cal.), that would establish deadlines for EPA to sign a notice of final rulemaking on certain SIP revisions. 

FWS removed the Florida golden aster from the Federal List of Endangered and Threatened Plants due to recovery. 

NMFS gave notice that all Middle Columbia River steelhead occurring in all accessible reaches upstream of Round Butte Dam on the Deschutes River in Oregon will be designated as threatened under the ESA when the nonessential experimental population designation and accompanying protective measures expire on January 15, 2025.

EPA announced the availability of data on emission allowance allocations to certain units under the Cross-State Air Pollution Rule trading programs.  

EPA proposed editorial and technical revisions to its Method 320 (Measurement of Vapor Phase Organic and Inorganic Emissions by Extractive Fourier Transform Infrared Spectroscopy). 

SIP Approval: Oklahoma (updates to incorporation by reference provisions of federal requirements). 

EPA approved revisions to Arkansas' CAA §111(d) state plan for existing kraft pulp mills subject to the Kraft Pulp Mills Emission Guidelines.

SIP Proposal: Delaware (public notice requirements for new source review and outer continental shelf permit programs).