× 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 XXIII/33: Twenty-Sixth Meeting of the Parties to the Montreal Protocol Document type Decision Reference number XXIII/33 Date Nov 21, 2011 SourceUNEP, InforMEA Status Active Subject Waste & hazardous substances, Air & atmosphere Treaty Montreal Protocol on Substances that Deplete the Ozone Layer (Sep 16, 1987) Meeting Website ozone.unep.org Abstract To convene the Twenty-Sixth Meeting of the Parties to the Montreal Protocol back to back with the tenth meeting of the Conference of the Parties to the Vienna Convention.