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Science & Tech., Ecology & Environment
Mahesh

29/08/22 22:30 PM IST

Recovery of ozone layer achieves significant milestone

In News 
  • As per NOAA (National Oceanic and Atmospheric Administration of US), the concentration of the ozone-depleting substance in mid-latitude has significantly reduced (to the level of 1980).
Ozone 
  • Ozone is a naturally occurring, highly reactive molecule made up of three oxygen atoms.
  • It is measured using the Dobson unit.
  • About 90% of the ozone in the atmosphere is concentrated between 15 and 30 kilometres above the earth’s surface (stratospheric ozone).
  • It is also found at ground level in lower concentrations (tropospheric ozone). Here ozone is a pollutant that is a key part of smog over cities.
  •  The region of the stratosphere with the highest amount of ozone is called the ozone layer.
  • The stratospheric ozone layer absorbs the sun’s ultraviolet rays and protects all biological systems on Earth from these harmful rays. 
Ozone depleting Substance 
  • Chlorofluorocarbons (CFCs) and other halogenated ozone-depleting substances (ODS)are mainly responsible for man-made chemical ozone depletion.
  • These are mainly used in refrigerators, air conditioners, fire extinguishers and foams.
Treaty for ODS regulations:
  • Vienna Convention for the Protection of the Ozone Layer (1985);
  • Montreal Protocol (regulated production and consumption of ODS, 1987);
  • Kigali Amendment (phase down the production and consumption of hydrofluorocarbons (HFCs))
Source- Down to Earth 

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