World Ozone Day is celebrated on
Option 1 : 22nd April
Option 2 : 5th June
Option 3 : 16th September
Option 4 : 21st April
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World Ozone Day is celebrated on
Option 1 : 22nd April
Option 2 : 5th June
Option 3 : 16th September
Option 4 : 21st April
