EPA'S SUNWISE UV INDEX

From the United States Environmental Protection Agency:
The UV Index provides a forecast of the expected risk of overexposure to UV radiation from the sun. The National Weather Service calculates the UV Index forecast for most ZIP codes across the U.S., and EPA publishes this information. The UV Index is accompanied by recommendations for sun protection and is a useful tool for planning sun-safe outdoor activities.

http://www2.epa.gov/sunwise/uv-index

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