Physics World June 11, 2020
In moderate doses UVA and UVB are good for us in several ways. The ozone layer filters out more dangerous band of sunlight UVC. As well as damaging skin, UVC can also mangle the genetic material of viruses and bacteria, preventing them from reproducing. During the COVID-19 outbreak in China, buses were even bathed in UV light overnight. Because of the high risk to humans, operators wear hardcore safety equipment and go through specialized training. Researchers have discovered that a specific wavelength of UVC light – 222 nm – could be much less dangerous to humans, while still lethal for viruses and bacteria. Crucially, this far-UVC light has so far only been tested on mice at short exposure times and single doses. Much more research is needed to check its safety for humans, and its ability to damage SARS-CoV-2. Even the most optimistic researchers would admit that it is unlikely the technology could be ready in time for the COVID-19 pandemic, even if there is a second wave…read more. Video