Recognition of the adverse environmental impact of chlorofluorocarbons
(CFCs)(1) has led to an international agreement to cease their produc
tion. Hydrofluorocarbons (HFCs) are important CFC substitutes. An impo
rtant question regarding HFCs is: what is their impact on stratospheri
c ozone? While it is well known that HFCs themselves do not react with
ozone, questions have been raised regarding the possibility that spec
ies formed during the atmospheric oxidation of HFCs could deplete stra
tospheric ozone.