CFCs and other ozone-depleting substances (ODS) stay for a very long time (10-20 yrs) while ascending to the stratosphere
In the stratosphere, they breakdown under UV radiation into highly reactive atoms of chlorine (Cl), fluorine (F) and Bromine (Br)
These atoms then react with and break ozone (O3) downinto oxygen (O2) and atoms of oxygen (O)
Each Clin CFC can convert hundreds of O3intoO2