Environmental Protection Agency (EPA) MVAC Certification

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Which compound has an Ozone Depletion Potential factor of 1?

HCFC-22
CFC-12
CFC-11
HFC-134a

The correct answer is: CFC-11

The compound with an Ozone Depletion Potential (ODP) factor of 1 is CFC-11. This means that CFC-11 has the same ozone-depleting capability as the reference substance, which is trichlorofluoromethane. ODP is a measure that indicates the potential of a substance to damage the ozone layer, where a value of 1 indicates that the compound has the same effect as CFC-11. CFC-11 is a type of chlorofluorocarbon that was commonly used as a refrigerant, aerosol propellant, and in foam-blowing applications. Its high ODP is why its usage has been significantly restricted under agreements like the Montreal Protocol, which aims to protect the ozone layer by phasing out substances that deplete it. In contrast, the other compounds listed—HCFC-22, CFC-12, and HFC-134a—have different ODP values, with some being lower than 1, meaning they have less potential to affect the ozone layer compared to CFC-11. For instance, HCFC-22 has a smaller ODP than CFC-11 and thus contributes less to ozone depletion, while HFC-134a