According to skincancer.org, while it is difficult to measure precisely skin cancer and ozone depletion do seem to be connected. UV penetration over time is paticularily hard to measure, because of weather patterns and ozone destruction. But UV levels do contribute to causing skin cancer, among genes and many other factors. But because of ozone depletion by the mid-1990s the average clear sky erythemal radiation, which is just skin reddening or sunburn-inducing incidents have increased by 7% since the 1970s when measured at the same latitude. So overall, it is safe to say that ozone depletion cannot be good for preventing skin cancer.
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