Final answer:
Certain CFC and HCFC refrigerants are violations of the CAA, as their production and use have been phased out due to their impact on ozone depletion.
Step-by-step explanation:
Under the Clean Air Act (CAA), the release of certain CFC (Chlorofluorocarbon) and HCFC (Hydrochlorofluorocarbon) refrigerants is considered a violation. The production and use of CFCs have been phased out globally under the Montreal Protocol due to their role in ozone depletion.
HCFCs are also being phased out because they contribute to ozone depletion and have a high global warming potential. Some examples of CFC and HCFC refrigerants that are violations of the CAA include carbon tetrachloride, methyl chloroform, hydrochlorofluorocarbon-22 (HCFC-22), hydrochlorofluorocarbon-123 (HCFC-123), and hydrochlorofluorocarbon-124 (HCFC-124).