The Quadrennial Ozone Symposium Organizing Committee is pleased to announce the dates and location of QOS 2024. The meeting will be held in-person in Boulder, Colorado, USA from 15-19 July 2024, and hosted by the University of Colorado Boulder with a hybrid virtual option. We are excited to follow in the footsteps of a wonderful QOS 2021 graciously hosted online by Yonsei University, Korea. Please see below/attached the announcement poster and stay tuned for updates from the Organizing Committee on abstract submission, registration, venue, travel, and other information. We look forward to seeing everyone working on everything ozone science in Boulder and online in July 2024!