SIP Proposal: California (revisions concerning nonattainment fees for the 1979 one-hour ozone NAAQS in the Antelope Valley Air Quality Management District and Mojave Desert Air Quality Management District). 

EPA promulgated new greenhouse gas emissions standards for model year (MY) 2032 and later heavy-duty highway vehicles that phase in starting as early MY 2027 for certain vehicle categories, updated discrete elements of the Averaging Banking and Trading program, and added warranty requirements for batteries and other components of zero emission vehicles. 

EPA announced the availability of data on emission allowance allocations to certain units under the Cross-State Air Pollution Rule trading programs. 

SIP Approval: California (revisions to nonattainment new source review requirements for the 2015 ozone NAAQS in the Feather River Air Quality Management District). 

EPA made an interim final determination that the California Air Resources Board submitted a revised rule on behalf of the Antelope Valley Air Quality Management District and Mojave Desert Air Quality Management District that corrects deficiencies identified in its SIP provisions concerning rules submitted to address nonattainment fees for the 1979 one-hour ozone NAAQS. 

SIP Approval: Iowa (updates to incorporations by reference to methods for performance testing, updates to definitions, and adoption of most recent ozone NAAQS). 

SIP Proposal: Iowa (revisions to definitions, references to federal rules, and methods and procedures for performance test/stack test and continuous monitoring system). 

EPA established new emissions standards for criteria pollutants and greenhouse gases (GHGs) for light- and medium-duty vehicles that will phase in over model years 2027 through 2032; finalized revisions to the GHG program; established new standards to control refueling emissions from incomplete medium-duty vehicles, as well as battery durability and warranty requirements for light- and medium-duty electric and plug-in hybrid electric vehicles; and finalized minor amendments to update program requirements related to aftermarket fuel conversions, importing vehicles and engines, evaporative emission test procedures, and test fuel specifications for measuring fuel economy. 

EPA finalized a rule to remove the Title V permitting requirements for air curtain incinerators that only burn wood waste, clean lumber, yard waste, or a mixture of those, and are not located at title V major sources or subject to Title V for other reasons. 

United States v. Colonial Oil Industries, Inc., No. 4:24-cv-00069-RSB-CLR (S.D. Ga. Apr. 10, 2024). Under a proposed consent decree, a settling CAA defendant that allegedly failed to meet renewable fuel volume obligations for fuel it supplied to certain marine vessels and produced and sold gasoline that exceeded the applicable volatility standard must purchase and retire over 9 million renewable identification number credits, estimated to cost approximately $12.2 million, and pay a civil penalty of approximately $2.8 million.