The 2022 WMO/UNEP Ozone Assessment will contain the most up-to-date understanding of ozone depletion, reflecting the thinking of hundreds of international scientific experts who contribute to its preparation and review. This assessment will include an update on trends in ODSs, HFCs, global and polar ozone and the link between stratospheric ozone changes and climate, as well as a new chapter on the impacts of stratospheric aerosol injection on the stratosphere and ozone. Cochairs of the Scientific Assessment Panel (SAP) of the Montreal Protocol on Substances that Deplete the Ozone Layer are Dr. David W. Fahey of the NOAA Chemical Sciences Laboratory, USA, Dr. Paul A. Newman of the NASA Goddard Space Flight Center, USA, Dr. John A. Pyle of the University of Cambridge, UK, and Dr. Bonfils Safari of the National University of Rwanda, Butare. Sarah Doherty of CIRES, University of Colorado, USA is the Assessment Coordinator. Other members of the NOAA Earth System Research Laboratories (ESRL) are making substantial contributions to the report, serving as coauthors, contributors, reviewers, and editorial and support staff.