C|+O3 CIO+O2 C|o+O3一C}+O2 One chlorine atom in the ozone layer can catalyze the transformation of 100,000 ozone molecules to oxygen molecules in one or two years• Cl + O3 ClO + O2 • ClO + O3 Cl + O2 • One chlorine atom in the ozone layer can catalyze the transformation of 100,000 ozone molecules to oxygen molecules in one or two years