The answer is Chlorofluorocarbons
Chlorofluorocarbon (CFC) is used as the aerosol
propellant. An aerosol is a suspension in the gaseous form of solid or
liquid particles. When these compounds reach the stratosphere, UV light affects
them and they release chlorine atoms. Chlorine atoms are capable of breaking
down ozone molecules. With fewer ozone molecules, the ozone layer becomes
thinner and harmful UV light passes through it.
