SARS-CoV-2 presented a huge challenged and expose the deficiency in our lack of preparedness when it comes to combating airborne virus threats. Airborne transmittable viruses have been around since the early 19th century, but the approach to proactive mitigation has not improved. Far UV (222nm) offers that layer of protection. Because this particular wavelength exists in the spectrum range that it does, it has been proven to protected people from several viruses while in occupied spaces. See articles:
Far-UVC Light
Study shows Far-UVC light destroys COVID-19 virus and genome - Med-Tech Innovation
Far-Ultraviolet Light Is Another Way To Keep Our Public Spaces Safe
Far-UVC light prevents MRSA infection of superficial wounds in vivo | PLOS ONE
Researchers prove UV light can kill flu viruses without harming humans