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Dramatic loss of ozone in the lower stratosphere over Antarctica was first noticed in the 1970s by a research group from the British Antarctic Survey BAS who were monitoring the atmosphere above Antarctica from a research station The Halley Research Station BAS research stations in the AntarcticRumor has it that when the first measurements were taken in 1985 the drop in ozone levels in the stratosphere were so dramatic that at first the scientists thought their instruments were defective Replacement instruments were built and flown out It wasnt until they confirmed the earlier measurements several months later that the ozone depletion observed was accepted as genuineEvidence that human activities affect the ozone layer has been building up over the last 20 years ever since scientists first suggested that the release of chlorofluorocarbons CFCs into the atmosphere could reduce the amount of ozone over our headsThe breakdown products chlorine compounds of these gases were detected in the stratosphere When the ozone hole was detected it was soon linked to this increase in these chlorine compounds The loss of ozone was not limited to the Antarctic Around the same time the first firm evidence was produced that there had been an ozone decrease over the heavily populated northern mid-latitudes 30-60N However unlike the sudden and near total loss of ozone over Antarctica at certain altitudes the loss of ozone in mid-latitudes is much less and much slower Only a few percentage per yearWhat Is Ozone And How Is It FormedOzone O3 3 oxygen atoms occurs naturally in the atmosphere The earths atmosphere is composed of several layers We live in the Troposphere where most of the weather occurs such as rain snow and clouds Above the troposphere is the Stratosphere an important region in which effects such as the Ozone Hole and Global Warming originate Supersonic jet airliners such as Concorde fly in the lower stratosphere whereas subsonic commercial airliners are usually in the troposphere The
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