Dr. John Campbell (on Youtube) has been talking about using CO2 monitors as a proxy for understanding how recirculated (and therefore potentially full of fomite

Dr. John Campbell (on Youtube) has been talking about using CO2 monitors as a proxy for understanding how recirculated (and therefore potentially full of fomites) indoor air is. It's a good concept, since indoor CO2 is primarily generated by exhaling humans. It's important to keep your windows open!