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Which among the following is responsible for depletion of Ozone layer ?
1. Carbon monoxide
2. Carbon dioxide
3. Chlorofluoro carbon
4. Mercuric oxide

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Correct Answer - Option 3 : Chlorofluoro carbon

The correct answer is Chlorofluoro carbon.

  • The Ozone layer in the stratosphere is affected by the increase in the atmospheric concentration of CFC (chlorofluorocarbons).
  • In the atmosphere, CFCs drift slowly upward to the stratosphere, where they are broken up by ultraviolet radiation, releasing chlorine atoms, which can destroy ozone molecules.
  • CFCs are the main reason for the Ozone hole or depletion of the Ozone layer.
  • The other reasons for ozone depletion are a wide range of industrial and consumer applications, mainly refrigerators, air conditioners (hydrochlorofluorocarbons (HCFCs), and fire extinguishers.
  • Chlorofluorocarbons (CFCs) are nontoxic, nonflammable chemicals containing atoms of carbon, chlorine, and fluorine.
  • They are used in the manufacture of aerosol sprays, blowing agents for foams and packing materials, solvents, and refrigerants.


  • The Negative Effects of the ozone hole are certain types of skin cancers, eye cataracts, and immune deficiency disorders.
  • Ozone depletion is greatest near the poles.
    • Ozone depletion is greatest at the South Pole (Antarctica).
  • The ozone layer is a natural layer of gas in the upper atmosphere that protects humans and other living things from harmful ultraviolet (UV) radiation from the sun.
  • The ozone layer exists in the stratosphere, a layer 10 to 50 km above the Earth’s surface.
  • The international community established the Montreal Protocol on ozone-depleting substances in 1987, to address the destruction of the ozone layer.

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