FWS revised regulations concerning the issuance of enhancement of survival and incidental take permits under the ESA. 

SIP Proposal: Kentucky (updates to geographical boundary description and attainment status designation for the Henderson-Webster nonattainment area for the 2010 sulfur dioxide primary NAAQS).

SIP Proposal: Colorado (base-year emissions inventory for the Denver Metro/North Front Range 2015 eight-hour ozone nonattainment area, certification that existing Air Pollutant Emissions Notice (APEN) program fulfills the CAA’s emission statement rule requirement, and new requirement for annual certification of APEN reported emissions). 

EPA proposed to grant a second one-year extension of the attainment date for the Uinta Basin, Utah marginal nonattainment area under the 2015 ozone NAAQS, and to determine that the area attained the standard by the extended attainment date of August 3, 2023. 

SIP Proposal: Wyoming (regional haze). 

SIP Approval: District of Columbia (removal of requirements for gasoline vapor recovery systems installed on gasoline dispensers). 

FWS revised its regulations concerning protections of endangered and threatened species under the ESA by reinstating the general application of the "blanket rule'' option for protecting newly listed threatened species pursuant to §4(d) of the Act, with the continued option to promulgate species-specific §4(d) rules, and extending to federally recognized tribes the exceptions to prohibitions for threatened species that the regulations currently provide to the employees or agents of FWS and other federal and state agencies to aid, salvage, or dispose of threatened species.

FWS and NMFS finalized revisions to portions of their regulations that implement §4 of the ESA, concerning procedures and criteria used for listing, reclassifying, and delisting species on the lists of endangered and threatened wildlife and plants and designating critical habitat.

FWS and NMFS finalized revisions to portions of their regulations that implement §7 of the ESA concerning interagency cooperation procedures.

EPA entered into a proposed consent decree in Sierra Club v. Regan, No. 1:23-cv-00424-RCL (D.D.C.), concerning the Agency’s alleged failure to issue final federal plans implementing emissions guidelines for commercial and industrial solid waste incinerators and other solid waste incinerators in states that had not submitted approvable state plans that constituted unreasonably delayed agency action.