Every four years, the WMO issues a report that documents the advances in scientific understanding of ozone depletion, reflecting the thinking of the international scientific experts who have contributed to its preparation and review. These advances add to the scientific basis for decisions made by the Parties to the Montreal Protocol. The GIRPAS team has significantly contributed to this report, with reference time series derived from our monitoring activities at the Jungfraujoch station selected to illustrate the evolution of some important Ozone Depleting Substances (ODSs) as well as of the total loading in stratospheric chlorine and fluorine (see Figures 1-2, 1-13, 1-20 and Table 1-2). The full report can be downloaded here.