The Sun has hurled the most intense burst of radiation at Earth in more than two decades, a reminder that our star can flip from serene to violent in a matter of hours. The storm has pushed radiation ...

Extra sun protection is required when UV levels are very high (8-10) or extremely high (11+). Children are more sensitive to ...

Weather forecasts usually include a UV index, a measure of the intensity of ultraviolet radiation from the sun. The higher the number, the greater the risk to people. Most of the radiation that ...

Americans in 17 states are being advised to stay out of the sun today, as elevated UV radiation levels pose serious health risks. According to the Environmental Protection Agency (EPA), the ...