What is the hypothesis that long-living halogen compounds can cause ozone depletion?

The hypothesis regarding long-living halogen compounds, such as chlorofluorocarbons (CFCs) and halons, posits that these substances can deplete the ozone layer. When released into the atmosphere, these compounds can persist for years and eventually reach the stratosphere, where they are broken down by ultraviolet (UV) radiation, releasing chlorine and bromine atoms. These halogen atoms then catalyze reactions that lead to the destruction of ozone (O3) molecules, significantly reducing the ozone layer's ability to absorb harmful UV radiation. This process contributes to increased UV exposure at the Earth's surface, leading to various environmental and health issues.