EPA proposed nonattainment area classification thresholds and implementation requirements for the strengthened 2015 ozone NAAQS that were promulgated on October 1, 2015.

SIP Approval: Ohio (redesignation to attainment of the sulfur dioxide NAAQS for the Ohio portion of the Campbell-Clermont KY-OH nonattainment area).

SIP Proposal: Maryland (new volatile organic compound content limits and standards for architectural and industrial maintenance coatings).

SIP Proposal: California (emissions of volatile organic compounds and particulate matter from confined animal facilities in the Yolo-Solano air quality management district).

EPA extended the implementation deadline for certain facilities subject to the final rule establishing pretreatment standards under the CWA for discharges of pollutants into POTWs from onshore unconventional oil and gas extraction facilities.

EPA revised the regulations governing regulated small municipal separate storm sewer system permits in response to a remand from the Ninth Circuit by establishing two alternative approaches that a permitting authority can use to issue NPDES general permits under the terms of the remand.

The president issued Executive Order No. 13754, Northern Bering Sea Climate Resilience, in order to conserve Arctic biodiversity; support and engage Alaska Native tribes; incorporate traditional knowledge into decisionmaking; and build a sustainable Arctic economy that relies on the highest safety and environmental standards, including adherence to national climate goals, in the northern Bering Sea region.

EPA determined that the Sheboygan, Wisconsin, area has failed to attain the 2008 ozone NAAQS and therefore reclassified the area as “moderate.”

SIP Approval: Tennessee (approved progress report).

EPA amended its Risk Management Program regulations to improve chemical process safety, assist local emergency authorities in planning for and responding to accidents, and improve public awareness of chemical hazards at regulated sources.