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-Anasuya Das
formation The photochemical mechanisms that give rise to the ozone layer were discovered                 by the British ph...
Bad news • The amount of ozone layer began to drop sharply in  1980s. This decrease has been linked to synthetic  chemica...
ozone layer
ozone layer
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ozone layer

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ozone layer

  1. 1. -Anasuya Das
  2. 2. formation The photochemical mechanisms that give rise to the ozone layer were discovered by the British physicist Sidney Chapman in 1930. Ozone in the Earths stratosphere is created by ultraviolet light striking oxygenmolecules containing two oxygen atoms (O2), splitting them into individual oxygen atoms (atomic oxygen); the atomic oxygen then combines with unbroken O2 to create ozone, O3.The ozone molecule is also unstable (although, in the stratosphere, long-lived) and when ultraviolet light hits ozone it splits into a molecule of O2 and an atom of atomic oxygen, a continuing process called the ozone-oxygen cycle, thus creating an ozone layer in the stratosphere, the region from about 10 to 50 kilometres (33,000 to 160,000 ft) above Earths surface.
  3. 3. Bad news • The amount of ozone layer began to drop sharply in 1980s. This decrease has been linked to synthetic chemicals like chlorofluorocarbons(CFCs) which are used in refrigerators, fire extinguishers etc• In 1987, the united Nations Environment Programme (UNEP) succeeded in forging and agreement to freeze CFC 1986 levels.

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