Question

Why there's a whole on ozone layer?

Answer 1

greenhouse gas make hole on ozone layer.

Answer 2

because of many greenhouse gases like the  CFCs and other ozone depleting chemicals ,released by the environment of humans,delete the ozone which is the saviour of us.if this is getting continued,the suns ray is gonna hit us directly and people can get dissorder and will be suffer from skin cancer and other problems.that is why we are continuosly reminded to stop global warming by deforestation,letting out of air pollution sand etc.