I don’t know. I wouldn’t use it for some standard of COVID purity without some testing, but it seems sensible. It may be cheaper to get a fan than an CO2 monitor, but if I run a restaurant, and you come in and tell me your meter says I need to turn the fans up. The fans and their electricity, and the meter aren’t coming off the same budget.
We might have raised CO2 levels if people have lots of fizzy drinks. There are all sorts of things that may harmlessly raise the CO2 level. I can’t think of anything that is likely to absorb exhaled CO2 so we underestimate the covid risk, but I could be missing something.
