Pursuant to the Federal Clean Air Act (CAA or the Act), the Environmental Protection Agency (EPA) is approving the July 20, 2021, revisions to the Texas State Implementation Plan (SIP) concerning Reasonably Available Control Technology (RACT) requirements for sources covered by the 2016 Oil and Natural Gas Control Techniques Guidelines (CTG or CTGs) for the Dallas-Fort Worth (DFW) and the Houston- Galveston-Brazoria (HGB) nonattainment areas (NAAs) for the 2008 8-hour ozone National Air Quality Ambient Air Quality Standards (NAAQS).

The Environmental Protection Agency (EPA) is taking final action to approve three state implementation plan (SIP) revisions submitted by the State of California addressing the nonattainment new source review (NNSR) requirements for the 2015 8-hour ozone National Ambient Air Quality Standards (NAAQS). These SIP revisions address the South Coast Air Quality Management District (SCAQMD or ``District''), Imperial County Air Pollution Control District (ICAPCD or ``District''), and Ventura County Air Pollution Control District (VCAPCD or ``District'') portions of the California SIP.

The Environmental Protection Agency (EPA) is approving both a State implementation plan (SIP) revision and Title V operating permits program revision submitted by the Pennsylvania Departmental of Environmental Protection (PADEP) on behalf of the Commonwealth of Pennsylvania. The SIP revision pertains to Pennsylvania's general provisions regarding air resources, operating permit requirements, and plan approval and operating permit fees. This includes increases to existing plan approval application and operating permit fees.

The Environmental Protection Agency (EPA) is approving a State Implementation Plan (SIP) revision submitted by the North Carolina Department of Environmental Quality (NCDEQ), Division of Air Quality (DAQ), via a letter dated April 13, 2021. This SIP revision includes changes to NCDEQ's regulations regarding bulk gasoline terminals and plants, gasoline cargo tanks and vapor collection systems, and leak tightness and vapor leak requirements. EPA is approving these changes pursuant to the Clean Air Act (CAA or Act).