Sunlight is probably the most common source of ultraviolet radiation.

Name: Sunlight is probably the most common source of ultraviolet radiation.
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Sunlight contains UV radiation in the form of UV-A, UV-B, and UV-C, although the majority of UV-C is filtered out by the Earth's atmosphere before it reaches the surface. UV radiation can also be emitted by artificial sources such as tanning beds and black lights.

Sunlight Is Probably the Most Common Source of Ultraviolet Radiation