Title Montreal Protocol on Substances that Deplete the Ozone Layer 1987. Protocol to the Vienna Convention for the Protection of the Ozone Layer 1985 (1985 Vienna Convention). Parties Universal ratification. The first United Nations (UN) Treaty to gain such global application. Revisions Adjustments: 1991, 1992, 1993, 1995, 1996, 1997, 1998, 1999, 2000, 2007 & 2018Amendments: London 1990, Copenhagen 1992, Montreal 1997, Beijing 1999 & Kigali 2016 Location Montreal, Canada Came into force 1 January 1989 Subject Protection of the ozone layer What is the Montreal Protocol? The Montreal Protocol is a protocol to the 1985 Vienna Convention, which is a framework convention, aimed at: • restricting activities likely to damage the ozone layer • cooperation in gathering and exchanging information on the effects of human activities on the ozone layer The Montreal Protocol creates a timetable for phasing out and eliminating the production and use of substances that deplete the ozone layer. Revisions were made to the Protocol following