Which type of refrigerant is known to be ozone-depleting?

Chlorofluorocarbons (CFCs) are known to be ozone-depleting substances. Their chemical structure allows them to release chlorine atoms when they are broken down in the atmosphere, which then reacts with ozone (O3) and leads to the degradation of the ozone layer. The depletion of the ozone layer is a significant environmental concern, as it plays a vital role in protecting Earth from harmful ultraviolet (UV) radiation from the sun.

CFCs were widely used in refrigeration, air conditioning, foam-blowing, and as propellants in aerosol products. Due to their damaging effects on the ozone layer, the production and consumption of CFCs have been largely phased out under international agreements such as the Montreal Protocol.

In contrast, hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs) are designed to reduce environmental impacts. While HCFCs still have some ozone-depleting potential, they are significantly less harmful than CFCs. HFCs do not deplete the ozone layer at all but are potent greenhouse gases. Ammonia is a natural refrigerant that poses no risk to the ozone layer, although it is toxic and has other handling