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Evolution of the Montreal Protocol

The Montreal Protocol on Substances that Deplete the Ozone Layer was agreed on 16 September 1987 and entered into force on 1 January 1989.

The Second, Fourth, Seventh, Ninth and Eleventh Meetings of the Parties to the Montreal Protocol adopted, in accordance with the procedure laid down in paragraph 9 of Article 2 of the Montreal Protocol, certain adjustments and reductions of production and consumption of the controlled substances listed in the Annexes of the Protocol. These adjustments entered into force, for all the Parties, on 7 March 1991, 23 September 1993, 5 August 1996, 4 June 1998 and 28 July 2000, respectively.

The Second, Fourth, Ninth and Eleventh Meetings of the Parties to the Montreal Protocol adopted, in accordance with the procedure laid down in paragraph 4 of Article 9 of the Vienna Convention, four Amendments to the Protocol – the London Amendment (1990), the Copenhagen Amendment (1992), the Montreal Amendment (1997) and the Beijing Amendment (1999).

The London, Copenhagen, Montreal and Beijing Amendments entered into force, only for those Parties which ratified the particular amendments, on 10 August 1992, 14 June 1994 10 November 1999 and 25 February 2002, respectively.

  © Ozone Secretariat 2004