The Environmental Protection Agency (EPA) is withdrawing its August 22, 2019, proposed rule, which proposed both to determine that the EPA made an error in the area designations for the 2010 Sulfur Dioxide (SO<INF>2</INF>) Primary National Ambient Air Quality Standard (NAAQS) for portions of Freestone and Anderson Counties, Rusk and Panola Counties, and Titus County in Texas, and to correct the proposed error by modifying the designations of those areas to unclassifiable.

The Environmental Protection Agency (EPA) is approving, under the Clean Air Act (CAA), a revision to Indiana's State Implementation Plan (SIP) to address changes to its air emissions monitoring rules for Portland cement plants. Indiana revised its rules for Portland cement plants to update the monitoring of particulate matter (PM) emissions to allow an additional monitoring option. This additional monitoring option is consistent with EPA's recent revisions to Federal requirements for Portland cement plants. EPA proposed to approve this action on March 25, 2021 and received no comments.

The Environmental Protection Agency (EPA) is taking final action to approve, or conditionally approve, all or portions of three state implementation plan (SIP) revisions submitted by the State of California to meet Clean Air Act (CAA or ``the Act'') requirements for the 2008 8-hour ozone national ambient air quality standards (NAAQS or ``standards'') in the Eastern Kern, California (``Eastern Kern'') ozone nonattainment area.

The Environmental Protection Agency (EPA) is taking final action to approve revisions to the Iowa State Implementation Plan (SIP) and is also approving revisions to the Iowa Operating Permit Program. The revisions include updating definitions, regulatory references, requiring facilities to submit electronic emissions inventory information under the state's Title V permitting program, and updating references for the most recent federally approved minimum specifications and quality assurance procedures for performance evaluations of continuous monitoring systems.