White House supports Far UV 222nm

Air disinfection: By inactivating (“killing”) airborne viruses through methods like ultraviolet germicidal irradiation (UVGI) systems, we can add another layer of protection in indoor spaces. The latest technology Far UV lights are particularly useful in crowded areas with poor airflow, in healthcare settings with vulnerable populations (such as hospitals or nursing homes), or in areas like restaurants where people aren’t wearing masks because they’re eating and drinking. For instance, one study demonstrated that when used with proper ventilation, UVGI is about 90% effective against the spread of airborne tuberculosis, equivalent to replacing the air in an indoor room up to 24 times in an hour.

https://www.whitehouse.gov/ostp/news-updates/2022/03/23/lets-clear-the-air-on-covid/