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In the stratosphere it serves a very important function, by acting to filter out most of the sun's ultraviolet radiation.
In the stratosphere it serves a very important function, by acting to filter out most of the sun's ultraviolet radiation.
Some activists claimed that this ozone layer has been threatened in recent decades by the release of [[chlorofluorocarbons]], on the theory that these act as [[catalyst]]s to break down the O<sub>3</sub> molecules.
Some scientists have measured a thinning layer of ozone over the north and south poles resulting from [[chlorofluorocarbons]], as they act as [[catalyst]]s to break down the O<sub>3</sub> molecules.<ref>http://ozonewatch.gsfc.nasa.gov/facts/hole.html</ref>
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[[category:Chemistry]]
[[category:Chemistry]]