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International Day for the Preservation of the Ozone Layer – 16 September
September 18 , 2021
1127 days
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- It was designated by the United Nations General Assembly in 1994.
- It is in commemoration of the date in 1987 on which nations signed the Montreal Protocol on Substances that Deplete the Ozone Layer.
- The closure of the hole in the ozone layer was observed 30 years after the protocol was signed.
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