What causes an Anoxic Event/ Destruction of the Ozone layer?

Question

What causes an Anoxic Event/ Destruction of the Ozone layer?

Answer 1

Nothing it was a hoax from the beginning. The ozone layer is formed when the solar wind  collide with the earth's magnetic field . It is so high that nothing gets that high except hydrogen and helium . They are too heavy. The ozone layer is at the very edge of space.