Ozone-Depleting Substance

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An ozone-depleting substance (ODS) is a compound that contributes to stratospheric ozone depletion.

ODSs include chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), halons, methyl bromide, carbon tetrachloride, and methyl chloroform. ODSs are generally very stable in the troposphere and only degrade under intense ultraviolet light in the stratosphere. When they break down, they release chlorine or bromine radicals, which then catalyze the breakdown of ozone into oxygen.

The EPA provides a list of class I and class II substances with their ozone depletion potentials, global warming potentials, and CAS numbers.