The Environmental Protection Agency (EPA) is approving a revision to the Indiana State Implementation Plan (SIP), authorizing temporary alternative opacity limitations at the BP Products North America, Inc. (BP) facility in Whiting, Indiana during startup and shutdown. This approval is consistent with the Clean Air Act (CAA) and EPA regulations regarding emissions during these periods in the refinery sector. EPA proposed to approve this SIP submission on August 17, 2022, and received no comments.

The Commonwealth of Kentucky, through the Kentucky Energy and Environment Cabinet (Cabinet), Kentucky Division for Air Quality (KDAQ), submitted a revision to the Kentucky State Implementation Plan (SIP) on November 29, 2022. The SIP revision updates the geographical boundary description and attainment status designation for the Henderson-Webster nonattainment area for the 2010 Sulfur Dioxide (SO<INF>2</INF>) primary National Ambient Air Quality Standards (NAAQS).

Based on the Environmental Protection Agency's (EPA's) reconsideration of the air quality criteria and the national ambient air quality standards (NAAQS) for particulate matter (PM), the EPA is revising the primary annual PM<INF>2.5</INF> standard by lowering the level from 12.0 [micro]g/m\3\ to 9.0 [micro]g/m\3\. The Agency is retaining the current primary 24-hour PM<INF>2.5</INF> standard and the primary 24-hour PM<INF>10</INF> standard.

The Environmental Protection Agency (EPA) is taking final action to approve, through parallel processing, a revised definition in the State Implementation Plan (SIP) and the Title V Operating Permit Program for the State of Connecticut. On November 30, 2023, the Connecticut Department of Energy and Environmental Protection (CT DEEP) submitted to EPA the State's adopted regulatory amendments to the definition of ``severe non-attainment area for ozone'' for inclusion in the EPA-approved SIP and Title V Operating Permit Program.