The ozone layer shields the Earth from harmful UV radiation.
Ozone depletion, weather, and the seasons cause different
amounts of UV radiation to reach the Earth. The UV Index tells
you how much. It predicts the next day's UV levels on a 1-11+
scale that helps you decide what to do to be safe in the sun.
You can find out what the UV Index forecast is where you live by
visiting the UV Index page and entering your zip code. What
follows is a description of each UV Index level, and tips to
help you avoid harmful exposure to UV radiation. A UV Index
reading of 11 or higher means extreme risk of harm from
unprotected sun exposure. Try to avoid sun exposure during
midday hours, from 10 a.m. to 4 p.m. Apply sunscreen with an SPF
of at least 15 liberally every 2 hours. It is possible to go
outside when the UV Index is 11 or higher. Make sure you always
seek shade, wear a hat, cover up, wear 99-100% UV-blocking
sunglasses, and use sunscreen. Or you can opt to stay indoors
and take the opportunity to relax with a good