NASA / GODDARD SPACE FLIGHT CENTER / SCIENCE PHOTO LIBRARY NASA / GODDARD SPACE FLIGHT CENTER / SCIENCE PHOTO LIBRARY
Coloured satellite image of the hole in the ozone layer above Antarctica. Blue indicates low ozone levels. Green, orange and yellow represent higher ozone levels. The ozone hole is a seasonal phenomenon that occurs during the Antarctic spring (August and September). Polar winds keep cold air trapped above the continent, and reactions between ice clouds, sunlight and man-made chlorine degrades the ozone layer of the atmosphere. Levels of ozone-damaging chemicals have fallen since the 1987 Montreal Protocol. Image taken by NASA's Aura satellite on 16th September 2013.
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