The UV Index (or UVI) is a standard international measure of ultraviolet radiation emitted by the Sun - which penetrates the Earth's atmosphere and can cause sunburn. Index values start at zero and then can rise above 10.

The ultraviolet index, or UV index, is an international standard measurement of the strength of the sunburn -producing ultraviolet (UV) radiation at a particular place and time. It is primarily used in daily and hourly forecasts aimed at the general public.

The UV Index is a measure of the strength of the sun’s UV rays. As the UV increases, the sun’s rays can do more harm to your skin, eyes, and immune system. The UV Index scale