In which layer of the earth’s atmosphere is the ozone layer found?

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SSC GD Previous Paper 22 (Held On: 1 March 2019 Shift 1)_English
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  1. Troposphere
  2. Mesosphere
  3. Exosphere
  4. Stratosphere

Answer (Detailed Solution Below)

Option 4 : Stratosphere
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The correct answer is ​Stratosphere.

  • Ozone Layer lies in the stratosphere which is 15 to 30 km above the Earth's surface.

Key Points

  • The ozone layer acts as a shield for the earth that absorbs Sun's ultraviolet radiation.
  • It is mainly found in the lower portion of the stratosphere and its thickness varies from one place to another.
  • It absorbs 97 to 99% of the Sun's ultraviolet light of medium frequency.
  • The chemical formula of ozone is O3 as it contains three oxygen atoms.

Additional Information

  • Today Ozone Layer is getting depleted due to the use of chemicals by the industries mainly chlorofluorocarbons (CFCs).
  • This depletion has threatened life on earth like increased skin cancer in humans and other environmental problems.
  • September 16 has been declared as ‘International Day for the preservation of Ozone layer’ by the United Nations General Assembly.
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