1. Chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) __________.
are ODP substances. Ozone Depletion Potential (ODP) is a measurement of the ability to destroy ozone by CFCs (R11, R12, and R500) and HCFCs (R-22 and R-123). CFCs have the highest ODP. HFCs (R-134a) do not contain chlorine and have no Ozone Depletion Potential. (Page 1 EPA prep manual)