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Ultraviolet (UV) Radiation and Sun Exposure | US EPA
https://www.epa.gov/radtown/ultraviolet-uv-radiation-and-sun-exposure
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While we need some exposure to sunlight to help our bodies make vitamin D, too much UV is dangerous. Almost half the daytime total of UV radiation is received between 10 a.m. and 4 p.m. Even on a cloudy day, you can be sunburned by UV radiation.
