EPA announced the availability of Acute Freshwater Aquatic Life Screening Values for 6PPD and its transformation product 6PPD-quinone under the CWA. 

EPA established requirements for commercial refrigerating appliances and commercial ice machines, safe use of flammable refrigerants, and safe design, construction, installation, and operation of refrigeration systems; and listed several substitutes as acceptable for retail food refrigeration, commercial ice machines, industrial process refrigeration, cold storage warehouses, and ice skating rinks, pursuant to the Agency's significant new alternatives policy program.

SIP Proposal: Arizona (partial approval and partial disapproval of revisions concerning the implementation, maintenance, and enforcement of the 2012 fine particulate matter NAAQS).

SIP Approval: West Virginia (second 10-year limited maintenance plans for the 2006 24-hour fine particulate matter NAAQS for the Charleston area and the West Virginia portion of the Steubenville-Weirton, Ohio-West Virginia area).

SIP Approval: North Carolina (updates to 2026 on-road and nonroad emissions inventories, safety margins, and motor vehicle emissions budgets). 

SIP Proposal: Michigan (removal of redundant definition for "used oil"). 

EPA designated one new equivalent method for measuring concentrations of ozone in ambient air.

SIP Approval: California (revisions to meet extreme area requirements for the 1997 eight-hour ozone NAAQS in the Riverside Co. nonattainment area).

SIP Approval: Michigan (removal of redundant definition for "used oil"). 

FERC revised the pro forma Open Access Transmission Tariff to remedy deficiencies in the Commission’s existing regional and local transmission planning and cost allocation requirements.