The UV Index Chart for Measuring Ultraviolet Radiation Risk

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It's fun to play in the Sun but too much ultraviolet (UV) radiation can cause serious health effects.

The UV Index helps you plan your outdoor activities, prevent overexposure to the Sun, and take appropriate action, such as wearing a hat, sunglasses, and sunscreen.

The U.S. National Weather Service measures ultraviolet levels on a daily basis, and uses these numbers for various exposure levels. See chart below.

"Time to Burn" and "Actions to Take" apply to people with fair skin that sometimes tans but usually burns. People with lighter skin need to be more cautious. People with darker skin may be able to tolerate more exposure.

You can find out what the UV Index forecast is where you live by visiting this page and entering your zip code.

UV Index Number Exposure Level Time to Burn Actions to Take
0, 1, 2 Minimal 60 minutes Apply SPF 15 sunscreen
3, 4 Low 45 minutes Apply SPF 15 sunscreen; wear a hat
5, 6 Moderate 30 minutes Apply SPF 15 sunscreen; wear a hat
7, 8, 9 High 15-25 minutes Apply SPF 15 to 30 sunscreen; wear a hat and sunglasses
10 or higher Very high 10 minutes Apply SPF 30 sunscreen; wear a hat, sunglasses, and protective clothing

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