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This article is from the Ozone Depletion: Stratospheric Chlorine and Bromine FAQ, by Robert Parson rparson@spot.colorado.edu with numerous contributions by others.

05 Where does the Chlorine in the stratosphere come from?

~80% from CFC's and related manmade organic chlorine compounds,
such as carbon tetrachloride and methyl chloroform

~15-20% from methyl chloride (CH3Cl), most of which is natural.

A few % from inorganic sources, such as volcanic eruptions.
[Russell et al. 1996] [WMO 1991, 1994] [Solomon] [AASE]
[Rowland 1989,1991] [Wayne]

These estimates are based upon >20 years' worth of measurements of
organic and inorganic chlorine-containing compounds in the earth's
troposphere and stratosphere. Particularly informative is the
dependence of these compounds' concentrations on altitude and
their increase with time. The evidence is summarized in section 2
of this FAQ.

 

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science, engineering, ozone layer, stratosphere, chlorine, bromine, volcanoes, Chloro Fluoro Carbons, CFC