From San Francisco, at a meeting of the American Geophysical Union
The ozone-free zone that develops high in the atmosphere over Antarctica each summer was a result of the presence of chlorine- and bromine-containing chemicals may not heal until 2065, about 15 years later than previously projected.
Over most of the world, an ozone layer blocks much of the sun's ultraviolet radiation from reaching Earth's surface. However, in the extremely cold air over Antarctica, the combination of sunlight and certain gases, such as the chlorofluorocarbons used in refrigeration, readily destroys ozone.
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