What exactly is the UV Index? A dermatologist explains.

The UV Index measures the ultraviolet radiation coming from the sun. There are three primary types of UV radiation: ...
Lansing State Journal

What does the UV index say? When to get out of the sun

The UV index measures the intensity of skin-damaging ultraviolet radiation at the Earth's surface. The UV index ranges from 0 to 11-plus, with higher values indicating greater risk of sunburn and skin ...