The stratospheric ozone ( o 3 ) layer to protect us from harmful ultraviolet radiation. it does so by absorbing ultraviolet light and falling apart into an o 2 molecule and an oxygen atom, a process known as photodissociation. o 3 (g)→ o 2 (g)+o(g)

Without the protection of the stratospheric zone, the UV rays can cause skin damage over a prolonged duration in the sun. If this happens the risk for skin cancer is increased. It's best not to be out in the sun for any long period of time between the hours of 10:00 a.m. to 2;00 p.m. when the ultraviolet rays of the sun are strongest.

What exactly do you mean