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The ozone hole is of concern because high-altitude ozone shields Earth from ultraviolet radiation.NASA chief atmospheric scientist Paul A. Newman says the main reason for this year’s result is local weather. The upper air has been almost 2 degrees warmer than normal in the globe’s southernmost region. That has led to fewer polar stratospheric clouds. These clouds are where chlorine and bromine, which come from man-made products, nibble away at ozone.