When is Ozone day observed?
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World Ozone Day is observed on September 16 each year.
World Ozone Day or International Day for Preservation of Ozone Layer is observed on September 16 every year.
In 1994, the United Nations General Assembly proclaimed 16 September the International Day for the Preservation of the Ozone Layer, commemorating the date of the signing, in 1987, of the Montreal Protocol on Substances that Deplete the Ozone Layer (resolution 49/114).