The first study which suggested a decreased concentration of atmospheric ozone over Antarctica was published in 1985 by J. C. Farman, B. G. Gardiner, and J. D. Shanklin. In the following year, NASA scientists used satellite data to show that the “hole” was localized over the Antarctic region. Since the discovery of the hole, scientists have determined that its size is primarily affected by the amount of bromine and chlorine in the atmosphere. The status of the ozone layer has been monitored by NASA since the 1970s, and if you’re interested more information can be found here.
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