Ozone: Formation, Depletion and Montreal Protocol YouTube Lecture Handouts

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Ozone: Formation, Depletion and Montreal Protocol

Ozone-Oxygen Cycle

Oxygen-Ozone Cycle in Presence of Sunlight


  • 15 - 30 km
  • UV-C: Short λ, Most Damaging, Totally filtered by atm.
  • UV-B: Medium λ, Biologically Active, Tanning
  • UV-A: Long λ, 95 % of UV, Penetrate deeper layers, ageing and wrinkling, skin cancers
  • Ozone layer: By French physicists Charles Fabry and Henri Buisson in 1913
  • Ozone hole: Antarctica every spring (discovered by Joseph Farman, Brian Gardiner, & Jonathan Shanklin of British Antarctic Survey in 1985) .

Ozone Destruction

Ozone Destruction
The Sun and Stratosphere
Stratospheric Halogen Gases

Montreal Protocol

Vienna Convention for Protection of Ozone Layer (1985) : Protect health

Montreal Protocol on Substances That Deplete the Ozone Layer: Signed in 1987 & effective 1989.

Montreal Protocol Milestones

5 Amendments

  • London Amendment (1990) – 185 nations
  • Copenhagen Amendment (1992) – 176
  • Vienna Amendment (1995) -
  • Montreal Amendment (1997) - 152
  • Beijing Amendment (1999) -124 nations

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