Ozone-Depleting Substance

Ozone-Depleting Substance (ODS) is a compound that contributes to stratospheric ozone depletion.

ODS include CFCs, HCFCs, halons, methyl bromide, carbon tetrachloride, and methyl chloroform. ODS 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 atoms, which then deplete ozone.

The EPA provides a list of class I and class II substances with their ODPs, GWPs, and CAS numbers.