SIP Proposal: North Carolina (revision to approved motor vehicle emissions budgets). 

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). 

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. 

SIP Approval: Nevada (second ten-year plan for maintaining the 1997 eight-hour ozone NAAQS in Clark County). 

EPA finalized the residual risk and technology review conducted for the Commercial Sterilization Facilities source category regulated under NESHAPs; took final action to correct and clarify regulatory provisions related to emissions during periods of startup, shutdown, and malfunction; and took final action to require owners and operators to demonstrate compliance through ethylene oxide continuous emissions monitoring systems. 

EPA gave notice that it has responded to petitions for reconsideration and administrative stay of a final action under the “good neighbor” or “interstate transport” provision of the CAA published in the Federal Register on June 5, 2023, titled "Federal 'Good Neighbor Plan' for the 2015 Ozone National Ambient Air Quality Standards."