× Information on this section of ECOLEX comes from the InforMEA Portal which compiled information from MEA Secretariats with the support of the European Union. The accuracy of the information displayed is the responsibility of the originating data source. In case of discrepancy the information as displayed on the respective MEA website prevails. Decision XXXIII/12: Co-Chairs of the Open‑ended Working Group of the Parties to the Montreal Protocol Document type Decision Reference number XXXIII/12 Date Oct 29, 2021 SourceUNEP, InforMEA Status Active Subject Waste & hazardous substances, Air & atmosphere Treaty Montreal Protocol on Substances that Deplete the Ozone Layer (Sep 16, 1987) Meeting Thirty-Third Meeting of the Parties Website ozone.unep.org Abstract To endorse the selection of Mr. Martin Sirois (Canada) and Mr. Osvaldo Alvarez Perez (Chile) as co-chairs of the Open‑ended Working Group of the Parties to the Montreal Protocol in 2022.