What chemicals cause major damage to the protective ozone layer of the earth?

Q. Why is damage to the ozone layer a cause for concern? What steps are being taken to limit this damage?​

Q. The ozone layer: Between 15 and 50 km above the earth is a thin layer of gas called 'ozone'. It protects the earth from most of the sun's harmful ultraviolet radiation. Too much radiation causes blindness in animals and skin cancer in people. In 1985, scientists discovered a hole in the ozone layer in the Antartica. They have recently discovered a smaller hole over the arctic. The ozone layer is also becoming thinner over other locations of the earth too. Scientists believe that over the last 10 years about 30% of the ozone layer has disappeared. This damage is caused by chemicals. Choose the right statement(s) from the following.

Q. Why is the depletion of the ozone layer a cause for concern? What steps are being taken to limit this damage?

Q. "Damage to the ozone layer is a cause of concern." Justify the statement. Suggest any two steps to limit this damage.