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some is certain, some is hotly debated
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.
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>
Scientists have measured an annual, tempororary thinning layer of ozone over the north and south poles, called an "ozone hole".<ref>http://ozonewatch.gsfc.nasa.gov/facts/hole.html</ref>
What is controversial is much of this is a result of the breakdown of [[chlorofluorocarbons]] and the release of elemental [[chlorine]], which acts as [[catalyst]]s to break down the O<sub>3</sub> molecules.
*In April 1991, the Environmental Protection Agency announced that ozone levels in the Northern Hemisphere shrank as much as 5 percent over the United States in the past 10 years.
*In April 1991, the Environmental Protection Agency announced that ozone levels in the Northern Hemisphere shrank as much as 5 percent over the United States in the past 10 years.