SIP Approval: California (nonattainment new source review requirements for stationary sources in the El Dorado County Air Quality Management District).

EPA proposed to amend the general provisions for NESHAPs to address applicability and compliance issues resulting from the addition of a compound to the list of hazardous air pollutants under the CAA.

EPA announced the availability of the latest Motor Vehicle Emission Simulator model (MOVES4), which must be used in transportation conformity determinations outside of California after a two-year grace period and in future SIPs.

SIP Proposal: Florida (stationary source rules).

SIP Approval: Pennsylvania (second 10-year particulate matter limited maintenance plan for the Liberty Borough area).

EPA expanded the list of acceptable substitutes under the significant new alternatives policy program to include additional substitutes for use in the refrigeration and air conditioning and fire suppression sectors.

SIP Approval: Texas (vehicle inspection and maintenance requirements in the Dallas-Fort Worth and Houston-Galveston-Brazoria serious ozone nonattainment areas for the 2008 eight-hour ozone NAAQS).

SIP Approval: Ohio (attainment plan for the 2010 primary, health-based one-hour sulfur dioxide NAAQS in the Muskingum River nonattainment area).

United States v. Tadano Ltd., No. 4:23-cv-03232 (S.D. Tex. Aug. 31, 2023). Under a proposed consent decree, settling CAA defendants that imported, introduced into commerce, and sold heavy nonroad construction equipment containing diesel engines that were not certified to model year engine emission standards must collectively pay a civil penalty of $40 million and complete a project to mitigate harm caused by excess nitrogen oxide and particulate matter emissions from the noncompliant engines.

SIP Approval: New Hampshire (reasonably available control technology requirements for the 2008 and 2015 ozone NAAQS).