SIP Approval: North Carolina (revision to permit term for construction and operating permits).

EPA lowered current dust-lead hazard standards for floors and window sills.

SIP Proposal: District of Columbia (reasonably available control technology requirements for the 2008 ozone NAAQS).

SIP Approval: Colorado (revisions to particulate matter emissions standards for wood burning stoves).

United States v. ACC Chemical Co., No. 3-91-CV-10096 (S.D. Iowa July 18, 2019). Under a proposed amended consent decree, settling CERCLA defendants that released hazardous substances at the Chemplex Superfund site in Clinton, Iowa, must implement EPA's amended remedy for the site that was adopted by the Agency on December 26, 2012.

SIP Proposal: New Hampshire (maintenance plan and redesignation request for the Central New Hampshire 2010 one-hour sulfur dioxide nonattainment area).

NOAA revised CZMA regulations and associated guidance to provide states and NOAA with a more efficient process for making changes to state coastal management programs.

SIP Proposal: Massachusetts (interstate transport requirements for the 1997, 2008, and 2015 ozone NAAQS).

SIP Approval: Minnesota (revisions to sulfur dioxide emissions limits for an oil refinery in Dakota County).

EPA proposed updates and clarifications to substantive and procedural requirements for water quality certification under §401 of the CWA.