Image:Ozone altitude UV graph.jpg

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Levels of ozone at various altitudes, and related blocking of several types of ultraviolet radiation.

The ozone concentrations shown are very small, typically only a few molecules O₃ per million molecules of air. But these ozone molecules are vitally important to life because they absorb the biologically harmful ultraviolet radiation from the Sun. There are three different types of ultraviolet (UV) radiation, based on the wavelength of the radiation. These are referred to as UV-a, UV-b, and UV-c. The figure also shows how far into the atmosphere each of these three types of UV radiation penetrates. We see that UV-c (red) is entirely screened out by ozone around 35 km altitude. On the other hand, we see that most UV-a (blue) reaches the surface, but it is not as genetically damaging, so we don't worry about it too much. It is the UV-b (green) radiation that can cause sunburn and that can also cause genetic damage, resulting in things like skin cancer, if exposure to it is prolonged. Ozone screens out most UV-b, but some reaches the surface. Were the ozone layer to decrease, more UV-b radiation would reach the surface, causing increased genetic damage to living things.

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NASA. Studying Earth's Environment From Space. June 2000. (April 14, 2005) http://www.ccpo.odu.edu/SEES/index.html.

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• (del) (cur) 07:31, 14 April 2005 . . en:User:SEWilco SEWilco ( en:User_talk:SEWilco Talk) . . 504x380 (43379 bytes) (Levels of en:Ozone ozone at various altitudes, and related blocking of several types of en:Ultraviolet_radiation ultraviolet radiation. == Source == { { PD-USGov-NASA } } en:NASA NASA. Studying Earth's Environment From Space. en:June_2000 June 2000. ( en:April_14 April 14 en:2005 2005) http://www.ccpo.od)