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Ozone hole is caused by
1. acetylene
2. ethylene
3. chlorofluorocarbons
4. methane

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Correct Answer - Option 3 : chlorofluorocarbons

The correct answer is Chlorofluorocarbons.

  • CFCs and halons cause chemical reactions that break down ozone molecules, reducing ozone's ultraviolet radiation-absorbing capacity.
  • The stratospheric ozone layer absorbs ultraviolet (UV) radiation, preventing dangerous UV rays.
  • The term ‘ozone hole’ refers to the depletion of the protective ozone layer in the upper atmosphere (stratosphere) over Earth's polar regions.

  •  Montreal Protocol
    • It was signed in 1987 for the protection of Ozone layer depletion.
    • Developing and developed countries have equal but differentiated responsibilities under this protocol.
    • It has been ratified by 197 Parties making it the first United Nations treaty to be ratified by every country in the world.
    • The Kigali Amendment, an amendment to the Protocol, has helped reduce HFC emission.

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