The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision formally submitted by the State of Delaware. This revision consists of the base year inventory for the Delaware portion of the Philadelphia-Wilmington-Atlantic City, PA-NJ- MD-DE marginal nonattainment area (Philadelphia Area) for the 2015 ozone national ambient air quality standards (NAAQS). This action is being taken under the Clean Air Act (CAA).

The Environmental Protection Agency (EPA) is proposing a limited approval and limited disapproval of revisions to the South Coast Air Quality Management District (SCAQMD) portion of the California State Implementation Plan (SIP). These revisions concern emissions of volatile organic compounds (VOCs) and oxides of nitrogen (NO<INF>X</INF>) from refinery flares. We are proposing action on a local rule to regulate these emission sources under the Clean Air Act (CAA or the Act). We are taking comments on this proposal and plan to follow with a final action.

The Environmental Protection Agency (EPA) is proposing to approve state implementation plan (SIP) revisions submitted by the State of Colorado on May 13, 2020. The revisions contain amendments to the State's New Source Review (NSR) permitting program and Air Pollution Emission Notices (APENs). The EPA is taking this action pursuant to the Clean Air Act (CAA).

The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision formally submitted by the State of Maryland. This revision consists of the base year inventory for the Maryland portion of the Philadelphia-Wilmington-Atlantic City, PA-NJ- MD-DE marginal nonattainment area (Philadelphia Area) for the 2015 ozone national ambient air quality standards (NAAQS). This action is being taken under the Clean Air Act (CAA).