Ozone hole refers to:

The correct answer is option 3

Key Points

• The decrease in the density of ozone located in the stratosphere, that is, the depletion of the ozone layer, is called an ozone hole.

Additional Information

• ​Ozone Layer -
  • It is a layer of the Earth's atmosphere in which the concentration of ozone gas is relatively high.
  • It is mainly located in the lower part of the stratosphere from about 10 km to 30 km above the earth's surface.
  • Life on earth is possible only because of the ozone layer.
  • This layer absorbs 90-99% of the Sun's high-frequency ultraviolet light, which is harmful to life on Earth.
  • More than 91% of the ozone in the Earth's atmosphere is present here.
• Chlorofluorocarbon gas -
  • It is mainly responsible for the degradation of the ozone layer.
• 16 September -
  • This day was declared by the United Nations General Assembly as the International Day for the Protection of the Ozone Layer.