SIP Approval: New York (amendments to regulations that impose control measures for sources of particulate matter).

EPA withdrew its August 31, 2020, proposal to modify the definition of "municipal waste combustion unit" under the Standards of Performance for New Stationary Sources and Emissions Guidelines for Existing Sources: Other Solid Waste Incineration Units.

EPA finalized federal implementation plan requirements to address 23 states’ obligations to eliminate significant contribution to nonattainment, or interference with maintenance, of the 2015 ozone NAAQS in other states.

The White House Office of Science and Technology Policy notified the Earth Observations community that a draft of the congressionally-mandated National Plan for Civil Earth Observations will be released for a short national review period in Summer 2023.

SIP Approval: Pennsylvania (infrastructure requirements for the 2015 ozone NAAQS).

SIP Approval: California (revision concerning nitrogen oxide emissions from Portland cement kilns in the Mojave Desert Air Quality Management District).

SIP Approval: Missouri (revisions to state regulation for the restriction of particulate matter to ambient air beyond the premises of origin).

The U.S. Patent and Trademark Office expanded the Climate Change Mitigation Pilot Program to include innovations in any economic sector that are designed to make progress toward achieving net-zero greenhouse gas emissions, increased the filing limitations for petitions under the program, and extended the duration of the program. 

United States v. Eastman Chemical Resins, Inc., No. 2:23-cv-00867-MJH (W.D. Pa. May 24, 2023). Settling CWA, CAA, and RCRA defendants must perform injunctive relief, including conducting a third-party environmental audit, implementing effluent limit violations response requirements, performing facility specific work and repairs, completing comprehensive stormwater and groundwater control plans, and implementing a RCRA-based training program and daily inspection requirements; as well as pay a $2.4 million civil penalty in connection with alleged violations at a hydrocarbon resins manufacturing facility in Jefferson Hills, Pennsylvania.

EPA entered into a proposed consent decree under the CAA in California Communities Against Toxics v. Regan, No. 1:22-cv-03724 (D.D.C.), that would establish a deadline for the Agency to sign a final rule in connection with its alleged failure to perform its non-discretionary duty to “review, and revise as necessary” the NESHAPs: Ethylene Oxide Emissions Standards for Sterilization Facilities, at least every eight years.