UV rays may be associated with adverse health effects depending on the duration of exposure and the wavelength. Possible adverse health effects include erythema (sunburn), photokeratitis (a feeling of sand in the eyes), skin cancer, increased skin pigmentation (tanning), cataracts and retinal burns. Most skin cancers and the vast majority of UV exposure are caused by the sun. Artificial sources of UV rays, such as UV lighting, can also be carcinogenic.
Fortunately, artificial forms of UV lighting can be avoided or used safely to mitigate risk. For example, it's well known that tanning beds aren't safe, but they can simply be avoided. Scientists have known for decades that a type of ultraviolet light known as UVC light quickly kills microbes, including bacteria and viruses. However, conventional germicidal UVC light cannot be used directly to destroy airborne viruses in occupied indoor spaces because it is a potential health hazard.
of the skin and eyes. Many sources report that disinfection with UV lighting is the best option and will not harm equipment as much as harsh chemical cleaners. This would allow the tool to be used in many more places than are currently used with UV lights, which could have widespread effects and reduce the spread of many infectious diseases. Yes, you'll need special equipment and training to use UV lighting professionally in public environments.
The study suggests that far-ultraviolet light from lamps installed on the ceiling could be a very effective passive technology for reducing person-to-person transmission of airborne diseases, such as COVID and influenza, indoors, and reducing risk of the next pandemic. As for UV disinfection, lighting and the risk of cancer, as long as protective equipment is used when interacting with light and following all instructions, the risk can be mitigated, as mentioned above. Far ultraviolet light effectively inactivated influenza viruses, with about the same effectiveness as conventional germicidal ultraviolet light. There are some residential applications of UV lighting that do not require training, but any large scale commercial use will require instructions to ensure use suitable and safe.