Bromochlorofluorocarbons (BCFCs) are a group of chemicals that contain bromine, chlorine, fluorine, and carbon atoms. They are man-made compounds that were widely used as refrigerants, fire extinguishing agents, and cleaning solvents. However, due to their ozone-depleting properties and potential contribution to global warming, their production and use have been largely phased out under the Montreal Protocol.

BCFCs are halogenated hydrocarbons, which means they contain one or more halogens (such as bromine, chlorine, fluorine, or iodine) and hydrogen atoms bonded to a carbon atom. The presence of halogens in these compounds makes them highly stable and unreactive, which made them useful as refrigerants and fire suppressants.

However, when BCFCs are released into the atmosphere, they can react with stratospheric ozone, breaking it down into oxygen and other byproducts. This process contributes to the depletion of the ozone layer, which protects the Earth from harmful ultraviolet (UV) radiation from the sun.

In addition to their ozone-depleting properties, BCFCs also have global warming potential, meaning they can contribute to climate change when released into the atmosphere. For these reasons, international agreements such as the Montreal Protocol have been established to regulate and phase out the use of these chemicals in favor of more environmentally friendly alternatives.