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United Nations Environment Programme - Ozone Secretariat

The Vienna Convention for the protection of the Ozone Layer and its Montreal Protocol on substances that deplete the Ozone Layer

The Vienna Convention for the Protection of the Ozone Layer and its Montreal Protocol on Substances that Deplete the Ozone Layer are dedicated to the protection of the earths ozone layer. With 196 parties, they are the most widely ratified treaties in United Nations history, and have, to date, enabled reductions of over 97% of all global consumption of controlled ozone depleting substances (measured in ODP tonnes).

The Ozone Secretariat is the Secretariat for the Vienna Convention and for the Montreal Protocol. Based at the United Nations Environment Programme (UNEP) headquarters in Nairobi (Kenya), the Secretariat functions in accordance with Article 7 of the Vienna Convention and Article 12 of the Montreal Protocol.... More on the Secretariat

Bangkok, Thailand, 23 - 27 July 2012

32nd Meeting of the Open-Ended Working Group of the Parties to the Montreal Protocol

Bangkok, Thailand, 29 - 30 July 2012

48th Meeting of the Implementation Committee Under the Non-Compliance Procedure of the Montreal Protocol (Meeting Dates are Tentative)Padlock for Password Protection

Bali, Indonesia, 21 - 25 November 2011

Bali, Indonesia, 18 - 19 November 2011

Bali, Indonesia, 19 November 2011


Montreal Protocol Press Kit
(Ar) (Ch) (En) (Fr) (Ru) (Sp)

In April of this year, WMO’s press release on the ‘Record Stratospheric Ozone Loss in the Arctic of 2011’ was issued and also posted on the Ozone Secretariat website.  This phenomenon has now been investigated and analyzed using a comprehensive set of measurements. The article, “Unprecedented Arctic Ozone Loss in the Arctic in 2011” in the journal Nature was issued on 2 October.  The study involved 29 scientists from 19 institutions in 9 countries (United States, Germany, The Netherlands, Canada, Russia, Finland, Denmark, Japan and Spain).

The scientists found that in the 18-20 km altitude range the Arctic ozone loss exceeded 80%, a record loss. The cause was the high levels of chlorine and bromine from CFCs and halons .... More

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