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The Vienna Convention for the Protection of the Ozone Layer and the Montreal Protocol on Substances that Deplete the Ozone Layer logo was developed to provide a distinct brand for the two treaties across various communication assets and applications. The visual identity guideline is designed to provide a comprehensive overview of applications and correct use of the logo.

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On 15 October 2016, in Kigali, the parties to the Mon- treal Protocol on Substances that Deplete the Ozone Layer (the Montreal Protocol) reached agreement at their 28th Meeting to phase down consumption and production of hydrofluorocarbons (HFCs). They adopted an amendment (the Kigali Amendment) in Decision XXVIII/1. This briefing note has been prepared by the Secretar- iat of the Montreal Protocol to help Parties to the Pro- tocol prepare for ratification, acceptance, or approval of the Kigali Amendment.

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The Protocol, along with the Vienna Convention, achieved universal participation on 16 September 2009 – the first treaties of any kind in the history of the United Nations system to achieve that aspiration.

This edition has been updated to include all relevant information from 1989 to date.


Briefing notes
Baselines:  Past practices and current challenges

The purpose of this briefing note is to provide background information about the following areas:

  • The baselines agreed under the Montreal Protocol to date for CFCs, carbon tetrachloride, HCFCs and methyl bromide, as examples, in both non-Article 5 and Article 5 parties;
  • The time lag between the year in which a decision was taken and the years of the baseline and initial control measures;
  • The baselines that have been put forward in the HFC amendment proposals.