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Glossary
Protect Yourself, Family and Pets from Excessive Ultraviolet (UV) Radiation
What is the UV Index?
What is UV radiation?
How does UV vary in a day?
How do clouds, elevation, surface type and aerosols affect UV radiation?
How is the UV Index determined?
What US cities does UV Index cover?
How to prevent UV damage?
Is the Index validated?
Daily UV Forecast
Map of Danger Areas
Text List of UV Levels by City
Monthly Means and Maximums
Annual Time Series of UV Index Forecasts
Past UV Bulletins
NWS Local Forecasts