International Day for the Preservation of the Ozone Layer 2022,Theme, History, Ozone Layer, Montreal Protocol

International Day for the Preservation of the Ozone Layer 2022: The International Day for the preservation of the Ozone Layer also known as World Ozone Day is observed on the 16th of September every year.

Key Points:

  • The day aims to raise awareness about the importance and need of the Ozone layer which is the single protection on Earth against UV rays coming out from the sun.


The theme announced by the UN Environment Programme for International Day for the Preservation of the Ozone Layer 2022 is "Montreal Protocol @35: global cooperation protecting life on earth" for international ozone layer protection in order to encourage sustainable development.

Note: This year marks the 35th anniversary of the Montreal Protocol.


  • The United Nations General Assembly (UNGA)proclaimed September 16 as the International Day for the Preservation of the Ozone Layer in 1994.
  • The day marks the signing of the Montreal Protocol on Substances that deplete the Ozone Layer, in 1987, to preserve the ozone layer and prevent further damage to it.
  • This protocol, which curbs the use of ozone-depleting chemicals like aerosols, halons and chlorofluorocarbon, halons, was the first-ever to be ratified by all 197 members of the UN.

What is Ozone Layer?

  • The Ozone layer, also known as the Ozone shield, is a fragile layer of gas in the Earth’s stratosphere.
  • Life is not possible on Earth without the ozone layer.
  • Sunlight makes life, but the ozone layer creates life as we know it today.
  • It absorbs most of the Sun’s ultraviolet rays, which is harmful to human life and other life forms.
  • These rays can cause numerous skin diseases like cancer etc.
  • The layer absorbs about 97 to 99 percent of ultraviolet rays and maintains the ozone-oxygen cycle.

About the Montreal Protocol:

  • The Montreal Protocol on Substances that Deplete the Ozone Layer (the Montreal Protocol) is an international agreement made in 1987 where countries from across the globe decided to curb substances such as:
  • Aerosols
  • Chlorofluorocarbon
  • Halons.
  • It was designed to stop the production and import of ozone depleting substances and reduce their concentration in the atmosphere to help protect the earth's ozone layer.
  • These substances are widely used for cooling and refrigerating purposes.
  • As a result of the usage of these harmful substances, a hole in the ozone layers in Antarctica was discovered back in 1970, which ultimately led to acute global warming in the past 20 years.
  • Although the 1985 convention that gave rise to the Montreal deal did make progress in conserving the Ozone layer and further in January 2021, the Antarctic hole caused by Ozone-depletion was finally closed as a result of the collaborative efforts by these countries, according to the World Meteorological Organization.