The ultraviolet index or UV Index is an international standard measurement of the strength of the ultraviolet (UV) radiation from the sun at a particular place on a particular day. It is a scale primarily used in daily forecasts aimed at the general public, and is now available as an hourly forecast as well.
Its purpose is to help people to effectively protect themselves from UV light, of which excessive exposure causes sunburns, eye damage such as cataracts, skin aging, immunosuppression, and skin cancer (see the section health effects of ultraviolet light). Public-health organizations recommend that people protect themselves (for example, by applying sunscreen to the skin and wearing a hat) when the UV Index is 3 or higher; see the table below for complete recommendations.
Read more about Ultraviolet Index: Description, Definition, History, How To Use The Index
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