The Environmental Protection Agency (EPA) is redesignating the Oakridge, Oregon nonattainment area to attainment for the 1987 National Ambient Air Quality Standard for particulate matter of 10 microns or less (PM<INF>10</INF> NAAQS). The EPA is also approving a maintenance plan for the area that demonstrates continued compliance with the PM<INF>10</INF> NAAQS through the year 2035, which Oregon submitted, along with the redesignation request, for inclusion into the Oregon State Implementation Plan (SIP).

The Environmental Protection Agency (EPA) is taking final action to approve revisions to the Missouri State Implementation Plan (SIP) received on June 10, 2021. The submission revises Missouri's regulation on construction permit exemptions. These revisions update incorporations by reference, remove unnecessary words, and make minor clarifications and grammatical changes. These revisions do not impact the stringency of the SIP or have an adverse effect on air quality. The EPA's approval of this rule revision is being done in accordance with the requirements of the Clean Air Act (CAA).

The Environmental Protection Agency (EPA) is taking final action to partially approve and partially disapprove revisions to the Missouri State Implementation Plan (SIP) received on March 20, 2019 and June 10, 2021. The SIP revisions in the 2019 and 2021 submittals incorporate updates to construction permit requirement regulations for stationary and portable air sources in Missouri that help ensure ambient air quality standards are met.

The Environmental Protection Agency (EPA) is finalizing approval of a State Implementation Plan (SIP) revision submitted by the State of North Carolina on December 14, 2020, through the Department of Environmental Quality (DEQ), Division of Air Quality (DAQ), for the purpose of removing Lee, Onslow, and Rockingham Counties from North Carolina's motor vehicle inspection and maintenance (I/M) program. EPA is approving these changes pursuant to the Clean Air Act (CAA or Act).