International Day for the Preservation of the Ozone Layer
Encyclopedia
September 16 was designated by the United Nations General Assembly
United Nations General Assembly
For two articles dealing with membership in the General Assembly, see:* General Assembly members* General Assembly observersThe United Nations General Assembly is one of the five principal organs of the United Nations and the only one in which all member nations have equal representation...

 as the International Day for the Preservation of the Ozone Layer.

This designation was made on December 19 1994, in commemoration of the date, in 1987, on which nations signed the Montreal Protocol
Montreal Protocol
The Montreal Protocol on Substances That Deplete the Ozone Layer is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances believed to be responsible for ozone depletion...

on Substances that Deplete the Ozone Layer.

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