Under the protocol, the ozone-depleting potential, or ODP, of any substance is measured with respect to an equal mass of CCl 3F, or CFC-11, which is assigned a value of 1.0. Most other CFCs have ODPs that range from about 0.5 to about 1.3. Hydrochlorofluorocarbons, which are being used as transitional replacements (until 2020) for CFCs in refrigeration, have ODPs that are generally less than 0.5. Hydrofluorocarbons, which are also replacing CFCs as refrigerants, have ODPs of zero. Ozone-depleting potentials are based on existing scientific knowledge and are to be reviewed and revised periodically.
See D. E. Newton, The Ozone Dilemma (1995).
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.
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