This article is from the Ozone Depletion: Stratospheric Chlorine and Bromine FAQ, by Robert Parson firstname.lastname@example.org with numerous contributions by others.
True, but not relevant because this chlorine is in a form (HCl) that
is rapidly removed from the troposphere. Even at sea level there is
more chlorine present in organic compounds than in HCl, and in the
upper troposphere and lower stratosphere organic chlorine dominates
overwhelmingly. See section 2.1 above.