Add Yahoo as a preferred source to see more of our stories on Google. The sun's ultraviolet radiation, a short wavelength of light invisible to humans, can cause sunburns, which can lead to deadly ...

The summer sun is returning to Phoenix in full force, and with it comes an invisible hazard that can be just as potent as the heat: ultraviolet radiation. As triple-digit temperatures dominate the ...

Add Yahoo as a preferred source to see more of our stories on Google. Don't underestimate the intensity of the sun; its rays travel more than 90 million miles, but still can burn your skin any day of ...

The UV index measures the strength of the sun's ultraviolet (UV) radiation. The index ranges from 0 to 11, with higher numbers indicating greater risk of sunburn and skin damage. Protective measures, ...

It kept you dry in December — now it might be the secret to surviving July. As temperatures soar, a growing number of Americans are getting hip to what much of the world already knows: Umbrellas ...

Wear sunglasses on bright days. In winter, snow can reflect UV and nearly double exposure. Use SPF 30+ sunscreen if you burn easily. 3-5: Moderate (moderate risk of harm from unprotected sun exposure) ...

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 ...

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 ...

July is UV Safety Awareness Month, highlighting the risks of sun exposure during peak summer months. The UV index, a scale from 0-11+, indicates the strength of the sun's ultraviolet radiation and the ...

How sunny is too sunny? Sometimes it's tough to know, but as temperatures reach new highs in Michigan, understanding the UV index can help you avoid sunburns and heat-related illnesses. The sun's ...