The Mine Safety and Health Administration amended its existing standards to better protect miners against occupational exposure to respirable crystalline silica, a significant health hazard, and to improve respiratory protection for miners from exposure to airborne contaminants.

SIP Proposal: Iowa (revisions to definitions, references to federal rules, and methods and procedures for performance test/stack test and continuous monitoring system). 

EPA established new emissions standards for criteria pollutants and greenhouse gases (GHGs) for light- and medium-duty vehicles that will phase in over model years 2027 through 2032; finalized revisions to the GHG program; established new standards to control refueling emissions from incomplete medium-duty vehicles, as well as battery durability and warranty requirements for light- and medium-duty electric and plug-in hybrid electric vehicles; and finalized minor amendments to update program requirements related to aftermarket fuel conversions, importing vehicles and engines, evaporative emission test procedures, and test fuel specifications for measuring fuel economy. 

FWS announced the updated planning policies for the National Wildlife Refuge System to incorporate landscape conservation plans and consideration of climate change and other anthropogenic forces in refuge management. 

EPA announced the availability of and seeks comment on an update to the interim guidance on the destruction and disposal of per- and polyfluoroalkyl substances (PFAS) and materials containing PFAS; the updated guidance builds on information pertaining to technologies that may be feasible and appropriate for the destruction or disposal of PFAS and PFAS-containing materials, and identifies key data gaps and uncertainties that must be resolved before EPA can issue more definitive recommendations about PFAS destruction and disposal technologies.

EPA finalized a rule to remove the Title V permitting requirements for air curtain incinerators that only burn wood waste, clean lumber, yard waste, or a mixture of those, and are not located at title V major sources or subject to Title V for other reasons. 

NMFS announced its intent to conduct a five-year review of the endangered western distinct population segment of the Steller sea lion. 

United States v. Colonial Oil Industries, Inc., No. 4:24-cv-00069-RSB-CLR (S.D. Ga. Apr. 10, 2024). Under a proposed consent decree, a settling CAA defendant that allegedly failed to meet renewable fuel volume obligations for fuel it supplied to certain marine vessels and produced and sold gasoline that exceeded the applicable volatility standard must purchase and retire over 9 million renewable identification number credits, estimated to cost approximately $12.2 million, and pay a civil penalty of approximately $2.8 million.  

The National Highway Traffic Safety Administration proposed to establish two new federal motor vehicle safety standards specifying performance requirements for all motor vehicles that use hydrogen as a fuel source. 

EPA finalized changes to its test procedures required to be used by industries and municipalities when analyzing the chemical, physical, and biological properties of wastewater and other samples for reporting under the NPDES permit program.