06 August 2008

UV

SunlightThe portion of the sunlight that is filtered or blocked is ultraviolet radiation. There are three types of wavelengths :
  • UV-A : This is the longest wavelength and is not absorbed by the ozone. It penetrates penetrates deeply into the skin and can lead to cancer and premature skin aging. UV-A can penetrate glass, so you can even get too much sun from sitting in your car or near a sunny window. UVA doesn't feel hot and doesn't burn your skin.
  • UV-B: Involved in tanning and burning on the skin. It is partially blocked by the ozone layer.
  • UV-C is completely absorbed by the earth's atmosphere. However, as the earth's ozone layer continues to be depleted, more UVC radiation reaches the earth. It's also damaging to the skin.
All solar radiation produces free radicals and all solar radiation can give you sunburn, skin damage, and potentially skin cancer.

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