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Summary

Description

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.
Date Unknown date
Source [1]
Author NASA
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Licensing

Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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Original upload log

The original description page was here. All following user names refer to en.wikipedia.
date/time username edit summary
20:23, 23 March 2006 en:User:Kilo-Lima (sub)
07:39, 14 April 2005 en:User:SEWilco (More text)
07:31, 14 April 2005 en:User:SEWilco (Levels of <a href="/wiki/Ozone" title="Ozone">ozone</a> at various altitudes, and related blocking YAY! of several types of <a href="/wiki/Ultraviolet_radiation" title="Ultraviolet radiation">ultraviolet radiation</a>. == Source == {{PD-USGov-NASA}} <a href="/wiki/NASA" title="NASA">NASA</a>. ''Studying Earth's Environment From Space''. <a href="/wiki/June_2000" title="June 2000">June 2000</a>. (<a href="/wiki/April_14" title="April 14">April 14</a> <a href="/wiki/2005" title="2005">2005</a>) http://www.ccpo.od)

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Date/TimeThumbnailDimensionsUserComment
current15:38, 4 May 2006Thumbnail for version as of 15:38, 4 May 2006504 × 380 (42 KB)Elch~commonswikiLevels 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 O<sub>3</sub> per million molecules of air. But these ozone molecu
07:56, 1 April 2006Thumbnail for version as of 07:56, 1 April 2006504 × 380 (42 KB)MaksimLa bildo estas kopiita de wikipedia:en. La originala priskribo estas: 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 molec

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