The Internal Revenue Service announced that a petition had been filed requesting that polyoxymethylene be added to the list of taxable substances under §4672(a) of the Internal Revenue Code.

FWS proposed designating approximately 275,647 acres on the islands of Kaua‘i, Maui, and Hawai‘i, in the state of Hawaii as critical habitat for the ʻiʻiwi under the ESA.

SIP Proposal: Georgia (limited maintenance plan for the Macon 1997 eight-hour ozone NAAQS maintenance area).

SIP Approval: California (revisions concerning emissions of volatile organic compounds and nitrogen oxides from flares in the San Joaquin Valley Unified Air Pollution Control District and South Coast Air Quality Management District).

EPA approved the Michigan Environment, Great Lakes, & Energy request to revise or modify certain of its Agency-authorized programs to allow electronic reporting.

SIP Proposal: Kentucky (modification of permit application timing requirements for federally enforceable district origin operating permits in the Louisville Metro Air Pollution Control District).

EPA announced the availability of the final revision to the risk determination for the carbon tetrachloride risk evaluation issued under TSCA.

United States v. Buckhorn, Inc., No. 22-8989 (N.D. Cal. Dec. 20, 2022). A settling CERCLA defendant must pay $1,855,500 for response costs EPA incurred responding to the New Idria Mercury Mine site in San Benito County, California.

EPA entered into a proposed consent decree under the CAA in Center for Biological Diversity v. Regan, No. 3:22-cv-00052-WHO (N.D. Cal.), that would establish deadlines for EPA to sign notices of final rulemaking.

SIP Proposal: California (revisions concerning nonattainment new source review requirements for the 2015 eight-hour ozone NAAQS in the Bay Area Air Quality Management District).