Reference Terms
from Wikipedia, the free encyclopedia

UV index

The UV index is an international standard measurement of how strong the ultraviolet (UV) radiation from the sun is at a particular place on a particular day.

Its purpose is to help people to effectively protect themselves from UV light, which causes sunburns, eye damage such as cataracts, skin aging, and skin cancer (see the section health effects of ultraviolet light).

Public-health organizations recommend that people protect themselves (for example, by wearing sunscreen and a hat) when the UV index is 3 or higher.

Note:   The above text is excerpted from the Wikipedia article "UV index", which has been released under the GNU Free Documentation License.
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July 7, 2015

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updated 12:56 pm ET