Ozone depletion potential (ODP) is a measurement of how much damage a chemical can cause to the ozone layer in comparison to a similar mass of trichlorofluoromethane (CFC-11). The ODP of CFC-11 is 1.0, and the higher the ODP, the greater the damage a chemical can cause.
Here are some examples of ODPs for different chemicals:
Bromotrifluoromethane (halon-1301): Has an ODP of 10.0
Carbon dioxide (CO2): Has an ODP of 0
Chlorodifluoromethane: Has an ODP of 0.05
Carbon tetrachloride: Has an ODP of 1.2
Methyl chloroform: Has an ODP of 0.11
Hydrochlorofluorocarbons (HCFCs): Have ODPs ranging from 0.01 to 0.1
To calculate the overall potential of a controlled substance to deplete the ozone layer, multiply its ODP by its quantity in metric tonnes.
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