The UVI is an international, scientific
measure of the level of UV Radiation (UVR) at the Earth’s
surface. It was developed in the early 1990’s as part of an
international effort to raise public awareness of the risks of sun
The UVI is based on a scale starting
at 0 and going up to a maximum value of 14 or 15 during the summer,
and a minimum of less than 1 during winter. The higher the number
the greater the risk of skin and eye damaging exposure to UVR.