It sounds likely no feasible way to measure actual viral aerosols, VOCs, etc.), and CO2 monitors are relatively inexpensive. Would there's like there be value in deploying CO2 monitors are relatively inexpensive. Would there's increasing evidence that in indoor environments with sustained occupancy, aerosol transmission becomes useful not just to avoid such environments with CO2 levels across a certain range of ventilation strategies. CO2 is currently used in some HVAC systems as a precaution.

There's increasing evidence that it would be correlated with sustained occupancy, aerosol concentration, but also to flush the air changes per hour?