The Environmental Protection Agency (EPA) is approving a revision to the North Carolina State Implementation Plan (SIP), submitted on July 16, 2020, by the State of North Carolina, through the North Carolina Department of Environment and Natural Resources, Division of Air Quality (NCDAQ) for the purpose of allocating a portion of the available 2026 safety margin in the 2008 8-hour Ozone Maintenance Plan to the 2026 nitrogen oxides (NO<INF>X</INF>) and volatile organic compounds (VOC) motor vehicle emissions budgets ("MVEBs" or "budgets") for the North Carolina portion of the Charlotte-Rock Hill, NC-SC bi-state Area (hereinafter referred to as the "North Carolina portion of the Charlotte Maintenance Area") to account for uncertainty associated with the mobile emissions model and unanticipated growth in vehicle miles traveled for the North Carolina portion of the Charlotte Maintenance Area. The revision also updates the 2026 MVEBs which are used for transportation conformity. NCDAQ's July 16, 2020, submission supplements the revised 2008 8-hour Ozone Maintenance Plan submitted by NCDAQ on July 25, 2018, and approved by EPA on September 11, 2019. EPA is approving North Carolina's July 16, 2020, supplemental SIP revision pursuant to the Clean Air Act (CAA or Act) and deeming the MVEBs adequate for transportation conformity purposes because the SIP meets all the statutory and regulatory requirements.