SIP Approval: California (revisions to permit rule and nonattainment new source review requirements for the 2008 eight-hour ozone NAAQS in the Antelope Valley air quality management district and Ventura County air pollution control district).

SIP Approval: California (revisions to permit rule and nonattainment new source review requirements for the 2008 eight-hour ozone NAAQS in the Antelope Valley air quality management district and Ventura County air pollution control district).

SIP Approval: California (revisions to permit rule and nonattainment new source review requirements for the 2008 eight-hour ozone NAAQS in the Antelope Valley air quality management district and Ventura County air pollution control district).

SIP Approval: California (revisions to permit rule and nonattainment new source review requirements for the 2008 eight-hour ozone NAAQS in the Antelope Valley air quality management district and Ventura County air pollution control district).

SIP Approval: California (revisions to permit rule and nonattainment new source review requirements for the 2008 eight-hour ozone NAAQS in the Antelope Valley air quality management district and Ventura County air pollution control district).

EPA proposed to update air regulations for outer continental shelf sources for which Alaska is the designated corresponding onshore area.

EPA proposed to update air regulations for outer continental shelf sources for which Alaska is the designated corresponding onshore area.

EPA proposed to update air regulations for outer continental shelf sources for which Alaska is the designated corresponding onshore area.

EPA proposed to update air regulations for outer continental shelf sources for which Alaska is the designated corresponding onshore area.

EPA, in response to the D.C. Circuit's decision in Utility Solid Waste Activities Group v. EPA, No. 15-1219, 48 ELR 20151 (D.C. Cir. 2018), proposed regulations to implement the court's vacatur of provisions that allow unlined coal combustion residual impoundments to continue receiving coal ash unless they leak, and that classify "clay-lined" impoundments as lined, thereby allowing such units to operate indefinitely; the Agency also proposed to establish a revised date by which unlined surface impoundments must cease receiving waste and initiate closure.