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Due to the large scale production of CFCs for refridgerators reduces ozone
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Using baloons with instrumentation
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CFCs detected in ozone layer
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In 1981 scientists discovered an alarming low ozone layer over Antarctica measured at 160 DUs
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The scientists reset their instrumentation and showed once again low ozone layers in Antarctica
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CFCs at an all time high shown to deplete the ozone layer
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THe ozone was checked again and showed a very low amout of ozone and showed at the south pole a level 125 DUs which is in fact half of what it is recomended at 300Dus