Ozone depletion

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Destruction of the tropospheric (and stratospheric) ozone layer that shields the earth from ultraviolet radiation harmful to biological life. This destruction of ozone is caused by the breakdown of certain chlorine- or bromine-containing compounds (chlorofluorocarbons or halons) that break down when they reach the stratosphere and catalytically destroy ozone molecules.

See: Montreal Protocol.

Links

EPA: Basic Ozone Layer Science