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    Far UVC ultraviolet light is thought safe for humans, and deactivates 99.9% of airborne coronavirus in 25 mins

    Standard germicidal UVC ultraviolet light with a wavelength of 254 nm is routinely used to disinfect hospital rooms and toilets when humans are not present, but is not safe to use when people are there, since this light has harmful effects on human skin, and is linked to skin cancer. However...