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NOAA / SCIENCE PHOTO LIBRARY NOAA / SCIENCE PHOTO LIBRARY
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Antarctic 'ozone hole' in 1996. Map of total atmospheric ozone concentration in the southern hemisphere on 6 October 1996. The colours represent the ozone concentration in Dobson Units (DU). The 'ozone hole' is at centre, coloured in blue (300-210 DU), purple (210-100 DU) and grey (less than 100 DU). Although smaller in area than in recent years, the ozone hole appears 'deeper' (ie more depleted). Normal 'healthy' values are around 280 DU. The data comes from the TIROS Ozone Vertical Sounder (TOVS) instrument on an American TIROS weather satellite.
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