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The protective ozone layer in the Arctic that keeps out the sun's most damaging rays - ultraviolet radiation - has thinned about 40 percent this winter. The Arctic's damaged stratospheric ozone layer isn't the best known "ozone hole' - that would be Antarctica's, which forms when sunlight returns in spring there each year. But the Arctic's situation is due to similar causes: ozone-munching compounds in air pollutants that are chemically trigged by a combination of extremely cold temperatures and sunlight. [Source: The Boston Globe]
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