Higher intensities probably kill accordingly faster. 0.1mW/cm^2 isn't a very high intensity, so real time air cleaning would be feasible. Also, everything point

Higher intensities probably kill accordingly faster. 0.1mW/cm^2 isn't a very high intensity, so real time air cleaning would be feasible. Also, everything points towards that even if you cannot prevent infections, cutting down the virus count seems to make a huge difference in the disease severity.