The ozone depletion potential (ODP) of a chemical compound is the relative amount of degradation to the ozone layer it can cause, with trichlorofluoromethane (R-11 or CFC-11) being fixed at an ODP of 1.0. Chlorodifluoromethane (R-22), for example, has an ODP of 0.05.
The first proposal of ODP came from Wuebbles in 1983. It was defined as a measure of destructive effects of a substance compared to a reference substance.[1]
Precisely, ODP of a given substance is defined as given as the ratio of global loss of ozone due to given substance and global loss of ozone due to CFC-11 of the same mass.
ODP can be estimated from the structure of a given substance. Chlorofluorocarbons have ODPs roughly equal to 1. Brominated substances have usually higher ODPs in range 5 - 15, because of more aggressive bromine reaction with ozone. Hydrochlorofluorocarbons have ODPs mostly in range 0.005 - 0.2 due to the presence of the hydrogen which causes them to react already in the troposphere and therefore reducing their chance to reach the stratosphere.
In a similar way has been defined global warming potential (GWP) as a measure representing potential of a substance to contribute to the global warming.
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