Antarctic ozone depletion. Coloured satellite map of atmospheric ozone in the southern hemisphere on September 6,2000. The ozone hole (green) over Antarctica (dark green) is at its 2000 maximum of 11 million square miles. The ozone layer's thick- ness is measured in Dobson Units (DU) with 300 being an average figure. The map is colour-coded: blue to magenta (300-340 DU),red to yellow (200- 280 DU) and green (100-200 DU). The ozone hole is due to atmospheric pollution by halogen compounds from halons like CFCs (chlorofluorocarbons). It is greatest around October during the Antarctic spring. Data from the TOMS (Total Ozone Mapping Spectrometer) instrument on the TOMS-EP satellite | |
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