World Ozone Day is observed on 16 September because on that day in 1987:
- Athe Kigali Amendment was adopted
- Bthe Montreal Protocol was signed
- Cthe ozone hole over Antarctica was discovered
- Dthe Vienna Convention came into force
Show answer and explanation
Correct answer: (b) the Montreal Protocol was signed
Explanation
The Montreal Protocol on substances that deplete the ozone layer (such as CFCs) was signed on 16 September 1987 and came into force in 1989. India is a party.