Ultraviolet light is subdivided into UV-A (315 to 400 nm), UV-B (280-315 nm), and UV-C (100-280 nm). Artificial UV used for disinfection is almost always UV-C, so UV and UVC are often used ...

There seems to be a misconception around that you can't get sunburned if it is cloudy because the clouds block the sunlight.

Making ultraviolet lights safe for people Traditional UV systems use wavelengths at or around 254 nanometers. At these wavelengths the light is dangerous to human skin and eyes, even at low doses .

Germicidal ultraviolet light has been demonstrated to work in reducing the transmission of several bacterial and viral infections. Some which include lessening the transmission of measles, mumps ...

The ultraviolet light reduced transmission of the disease by about 80 percent, the researchers concluded. Scientists are now also exploring what is called far UVC — an even shorter, ...