The Global Solar UV Index (UVI) is a simple measurement of the UV radiation level at the Earth's surface. It has been designed to indicate the potential for adverse health effects and to encourage people to protect themselves. The higher the Index value, the greater the potential for damage to the skin and eye, and the less time it takes for harm to occur. In countries close to the equator, the UVI can be as much as 20. Summertime values in northern latitudes rarely exceed 8.
From collection: Vital Ozone Graphics 2.0 - Climate Link
Emmanuelle Bournay, GRID-Arendal