When chlorofluorocarbons (CFCs) are released into the atmosphere, they rise up to the Ozone layer. The ultraviolet radiation from the Sun then breaks down the CFCs to release a Chlorine radical. The Chlorine radical then reacts with Ozone (O3) in the equation: Cl•+O3→ClO•+O2 Then the ClO• radical reacts with another O3 molecule: ClO•+O3→Cl+2O2 This releases two oxygen molecules and the chlorine radical.