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: ...
Kaleido Scope

Sun’s rays and heat waves: What UV radiation does to one’s skin

Ultraviolet radiation, a high-frequency form of energy from the sun, is classified in the same risk category as X-rays and nuclear radiation. As temperatures and sun exposure increase, experts at the ...
The Florida Times-Union

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 ...