Which group of compounds is chiefly responsible for depletion of the ozone layer?

Explanation

1. 01

   Chlorofluorocarbons drift up to the stratosphere, where ultraviolet light breaks them apart and releases chlorine atoms.

2. 02

   Each chlorine atom then destroys many ozone molecules before it is removed, which is why small quantities did so much damage.

3. 03

   Carbon dioxide and methane are greenhouse gases and drive warming; sulphur dioxide causes acid rain. Neither problem is the same as ozone depletion.