No, it’s not used. As is known, UV-C radiation has a wavelength of 200-280 nm. UVC lamps deactivate microorganisms through the radiation they emit. UVC lamps are carcinogenic. They are toxic due to their high ozone production. Direct contact of the radiation with the skin can cause skin cancer, and contact with the eyes can lead to blindness.
There is a direct exposure time for microorganisms to be inactivated by the radiation, which is about 3-6 seconds. Considering that air is fluid, UVC lamps cannot provide inactivation through the airway. They are effective on microorganizm exposed directly to radiation in confined and narrow spaces with limited air movement.