World Ozone Day is celebrated on [2019, S] a. 5th June b. 21st April c. 22nd April d. 16th September
Option D. 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).
