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World Ozone Day is celebrated on

1. 5th June
2. 21st April
3. 22nd April
4. 16th September

Correct answer: 16th September

Solution

World Ozone Day is observed on 16 September to commemorate the signing of the Montreal Protocol, the international treaty aimed at protecting the ozone layer. This date is recognized globally to raise awareness about ozone depletion and environmental protection.

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