Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2025. This website is no longer updated and links to external websites and some internal pages may not work. More information »
Learn about the health effects of UV radiation, tips for staying safe in the sun, and Don't Fry Day.
Learn about the UV index how to understand the UV Index, and UV Index applications
Access UV Index applications, fact sheets, and materials in English and Spanish.
Explore how successful ozone layer protection is a part of our everyday life
