Question

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

Answer 1

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.