NASA EARTH OBSERVATORY / OZONE HOLE WATCH / SCIENCE PHOTO LIBRARY NASA EARTH OBSERVATORY / OZONE HOLE WATCH / SCIENCE PHOTO LIBRARY
Ozone hole changes 1979 to 2011, satellite images. The images are from 1979 (upper left), 1987 (upper right), 2006 (lower left) and 2011 (lower right). They show the distribution of ozone in the atmosphere above Antarctica and the South Pole on 16 September of each year, with a colour-coded key at lower centre. Blue and purple show low levels of ozone. Thanks to the Montreal Protocol of 1987, banning the chemicals causing the depletion, the ozone hole has stabilised in recent years and may be slowly recovering. The first two maps use data from the Total Ozone Mapping Spectrometer (TOMS) on the Nimbus-7 satellite. The final two use data from the Ozone Monitoring Instrument (OMI) on the Aura satellite. This set of images was published in 2012.
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