Again today, there's a ultraviolet radiation warning - if you're going to the beach, you'll need a tanning lotion with a spf of about 1000 or so. All of the major atmospheric gases, nitrogen, oxygen, carbon doxoide, water vapor, and ozone absorb in the UV wavelengths, however, ozone is by far the most important absorber. That's the good news.
Chlorine has a strong chemical attraction for ozone.
In the presence of sunlight, chlorine breaks down ozone into molecular oxygen and a substance called chlorine monoxide. The chlorine in other CFCs as well as the newly-formed chlorine monoxide, both are available to attack the ozone. These nasty CFCs can remain in the atmosphere for decades. Much of chlorine in the stratosphere has originated from manmade chemicals, and some of it is from natural sources. Because UV radiation is more energetic than visible radiation, increases in the amount of UV reaching the surface may produce harmful effects in most all life forms.