Another solution I have thought about is simple increasing the amount of fresh air brought into an indoor space. Laboratories, wood-working shops and other spaces that can produce unhealthy air have extremely high Air Change per Hour (ACH)[1] requirements. It's wasteful[2] since you also have to condition that air, but it seems like a simple solution to ensuring we dilute air swarming with potential virus.
Yes, and another big saver would be certain types of heat recovery system[1] that will allow you to recover the heat added to the supply air from the exhaust air without mixing (and thereby polluting) the air streams.
[1] https://www.engineeringtoolbox.com/air-change-rate-room-d_86...
[2] You can limit it a little bit with demand control ventilation, which monitors C02 exhaled by occupants and tunes ventilation accordingly.