It really works when UVC runs. When used properly, it can kill up to 99 percent of pathogens. This is why UVC treatment has been used for sterilizing equipment in clinical and laboratory settings for many years. It’s only in the last few years that UVC has started to take off for personal use, especially given the current COVID-19 pandemic.
But in various contexts, there are a lot of legitimate questions and concerns about the safety of using UVC disinfection. And so rightfully. UVC is an exceptionally strong form of ultraviolet radiation that, when not used correctly, can be dangerous to humans. We are almost never exposed to these high-frequency light waves because almost all the UVC emitted by the sun is blocked by the atmosphere. However, in mere minutes, exposure to artificial UVC light can cause sunburn.