Question

Which gas is mainly responsible for ozone layer depletion ?
1. SO₂
2. CO₂
3. CFCs
4. NH₃

Answer 1

Correct Answer - Option 3 : CFCs

The correct answer is CFCs.

• Chlorofluorocarbons (CFCs) are mainly responsible for ozone layer depletion.
• Refrigerators, air-conditioners, Fire extinguishers, Adhesives, aerosols are the major sources of ozone-depleting substances.
• About Ozone layer:
  • CFC has disrupted this balance and increase the degradation of Ozone gas which is called Ozone depletion.
  • Although ozone depletion is occurring in the stratosphere, the depletion is especially marked over the Antarctic region.
  • This has resulted in the formation of a large area of the thinned ozone layer, commonly called the ozone hole
  • Montreal Protocol in 1987 bans the production of CFCs, halons, and other ozone-depleting chemicals.
  • World Ozone Day is observed on the 16th of September every year.
  • The O₃ layer present in the stratosphere protects us from the harmful UV rays of the sun.
  • Ozone layer thickness is measured in Dobson units.