Ozone depletion

By Peter75256

  • loss of ozone in the lower stratosphere over Antarctica was first noticed in the 1970s by a research group from the British Antarctic Survey (BAS)

  • two United States chemists predicted that a class of chemicals called chlorofluorocarbons (CFCs)

  • Period: to

    test

  • Drop ozone layers

    The ozone layer levels dropped dramaticaly

  • an international meeting in Montreal created the world's first environmental convention.

  • an international meeting in London voted for a strengthened Montreal Protocol under which CFCs, halons and other ozone-destroying chlorine compounds would be phased out by 2005

  • the ozone hole over Antarctica was arguably the largest on record, with average ozone levels over Antarctica the thinnest ever observed. Polar stratospheric clouds (PSCs), which form during periods of

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