SIP Approval: North Carolina (modifications to emission control standards through amendments to several air quality rules and removal of a redundant rule for electric utility boilers). 

SIP Proposal: California (revisions concerning emissions of volatile organic compounds from vapor recovery systems of gasoline cargo tanks). 

EPA made an interim final determination that the California Air Resources Board has submitted a rule and other materials that correct deficiencies in its SIP provisions concerning emissions of volatile organic compounds from vapor recovery systems of gasoline cargo tanks. 

United States v. Cleveland-Cliffs Steel Corp., No. 15-cv-11804 (E.D. Mich. Oct. 19, 2023). A proposed modification to a consent decree requires a settling CAA defendant to replace, routinely test, and monitor the electrostatic precipitator at its steel manufacturing plant in Dearborn, Michigan; pay an $80,000 penalty to Michigan; and perform a state supplemental environmental project that consists of providing air purifiers to area residences near the plant.

EPA issued regulations to implement certain provisions of the American Innovation and Manufacturing Act; the rulemaking restricts the use of hydrofluorocarbons in specific sectors or subsectors in which they are used, establishes a process for submitting technology transitions petitions, establishes recordkeeping and reporting requirements, and addresses certain other elements related to the effective implementation of the Act. 

SIP Approval: Arkansas (revisions addressing excess emissions during periods of startup, shutdown, and malfunction events). 

SIP Disapproval: Delaware (revisions addressing excess emissions during startup, shutdown, and malfunction events). 

EPA proposed to approve Arkansas’ CAA §111(d) state plan revision for existing kraft pulp mills, accept the negative declaration for existing sulfuric acid plants and withdraw approval of the Arkansas state plan for existing sulfuric acid plants, and amend the agency regulations in accordance with CAA requirements.

EPA updated a portion of the outer continental shelf (OCS) air regulations that pertains to requirements for OCS sources for which Virginia is the designated corresponding onshore area.

EPA proposed revisions to the Guideline on Air Quality Models, including enhancements to the formulation and application of the Agency's near-field dispersion modeling system, AERMOD, and updates to the recommendations for development of appropriate background concentration for cumulative impact analyses, and announced the Thirteenth Conference on Air Quality Modeling, which will focus on these proposed revisions.