11 or more: Extreme

A UV Index reading of 11 or more means extreme risk of harm from unprotected sun exposure. Take all precautions because unprotected skin and eyes can burn in minutes.

• Try to avoid sun exposure between 10 a.m. and 4 p.m.

• If outdoors, seek shade and wear protective clothing, a wide-brimmed hat, and UV-blocking sunglasses.

• Generously apply broad spectrum SPF 30+ sunscreen every 2 hours, even on cloudy days, and after swimming or sweating.

• Watch out for bright surfaces, like sand, water and snow, which reflect UV and increase exposure.