Ozone depletion over the Arctic this winter was one of the worst ever measured, raising fears that efforts to halt the production of ozone-depleting chemicals have failed to stop depletion of the life-shielding gas in the stratosphere. A major international effort to measure Arctic ozone levels over the winter found a 60% loss at 60,000 feet above the North Pole, according to NASA, which supplied a high altitude ER-2 aircraft for sampling (DAILY, Jan. 31). "Last winter's ...

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