Mortenson Center Associate Director Karl Linden (left) and postdoctoral researcher Ben Ma (right) teamed up with other researchers to make a definitive statement about what UV exposures are required to kill off SARS-CoV-2. In October 2021, their study was published in Applied and Environmental Microbiology and is the first to comprehensively analyze the effects of different wavelengths of UV light on SARS-CoV-2 and other respiratory viruses. The findings are referred to as a “game changer” by the authors - the wavelength found to be extremely effective at killing the virus which causes COVID-19 is also safe for public spaces. Of almost every pathogen the team has ever studied, the SARS-CoV-2 is one of the easiest to kill with UV light. The specific wavelength of Far ultraviolet-C, at 222 nanometers, is blocked by the very top layers of human skin and eyes – meaning that it has limited to no detrimental health effects to humans at the levels that kill off the viruses.