On September 10, 2021, the Environmental Protection Agency (EPA) published a final rule in the Federal Register approving revisions to the Antelope Valley Air Quality Management District, Eastern Kern Air Pollution Control District and Yolo-Solano Air Quality Management District portions of the California State Implementation Plan (SIP). In that rulemaking, the EPA inadvertently cited the incorrect local effective date in identifying one of the rules being approved into the SIP. This document corrects that error in the final rule's preamble and regulatory text.