These are the first images, produced from data recorded by NASA's Upper Atmosphere Research satellite (UARS), and they show ozone destruction extending well beyond the Antarctic. The first image shows the distribution of chlorine monoxide in the northern hemisphere, showing particularly high concentrations over northern Europe. The second image shows the ozone levels through the atmosphere. Across a wide belt centred on the equator, total ozone amounts have decreased by 10%. At altitudes of 20km, ozone amounts have decreased by 50%. This depletion is likely to be a direct result of the release of sulphur dioxide and other aerosols following the volcanic eruption of Mount Pinatubo in June 1991.

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