The UV index (UVI) is a standard measurement of erythemal (sun-burn causing) UV intensity that gives a more objective measure than the old “time to burn” (which cannot account for skin tone). The scale is open-ended, but a UVI of greater than 10 is extreme and a UVI of less than 3 is low. For clear skies, the UVI depends mainly on the sun elevation angle and the ozone amount
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