HVAC - EPA Certification Practice Exam

The correct answer highlights that CFCs (chlorofluorocarbons) and HCFCs (hydrochlorofluorocarbons) are the refrigerants being phased out due to their detrimental effect on the ozone layer. CFCs are known to release chlorine atoms when they break down in the atmosphere, and chlorine is highly effective at destroying ozone molecules. Similarly, HCFCs are less damaging than CFCs but still contribute to ozone depletion.

International agreements such as the Montreal Protocol have been instrumental in the gradual phasing out of these substances to protect the environment. The aim is to transition to substances that have less impact on the ozone layer and global warming potential, which is why alternatives like HFCs and HFOs are being promoted despite their own environmental considerations.

Understanding this context is crucial for HVAC professionals, as it directly affects regulatory compliance, equipment choices, and overall industry practices in refrigerant management.