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But as the 80s and 90s progress, a clear change in atmospheric chemistry takes place at the bottom of the world. The hole starts small in the late 80s and spreads as subsequent winter cycles break apart ozone molecules. || ", "release_date": "2000-10-03T12:00:00-04:00", "update_date": "2023-05-03T13:58:19.357455-04:00", "main_image": { "id": 535458, "url": "http://svs.gsfc.nasa.gov/vis/a000000/a001200/a001203/a001203_pre.jpg", "filename": "a001203_pre.jpg", "media_type": "Image", "alt_text": "Total ozone over the South Pole for each September from 1979 through 2000 as measured by the TOMS instruments on Nimbus 7, Meteor 3, and Earth Probe. 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