# What is behind the destruction of the ozone layer?

Oct 12, 2017

Chrolofluorocarbon (CFCs) is the main criminal.

#### Explanation:

Chrolofluorocarbons(CFCs) ,as known as Freon, are suspected to be the main reason for the destruction of ozone layer and we have decided to ban the usage of CFCs in Montreal Protocol(1987).
https://en.wikipedia.org/wiki/Montreal_Protocol

When CFCs are decomposed by UV, they form chlorine radical($C l \cdot$) and react with ozone(${O}_{3}$).

${O}_{3} \to {O}_{2} + O \cdot$
${O}_{3} + C l \cdot \to C l O \cdot + {O}_{2}$ (1)
$C l O \cdot + O \cdot \to C l \cdot + {O}_{2}$ (2)

(1) and (2) are chain reactions. Thus, a small amount of $C l$ radical may destroy much more ${O}_{3}$ molecules. How awful!