In 1994, in commemoration of the anniversary of the day on which nations signed the Montreal Protocol on "Substances that Deplete the Ozone Layer", the United Nations General Assembly designated September 16 as International Day for the Preservation of the Ozone Layer.
The Montreal Protocol as well as te Vienna Convention for the Protection of the Ozone Layer were signed after it was discovered tat certain substances, such as Halocarbons, have a very high ozone-depleting potential (ODP).
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