I've had meetings in a 800 ppm CO2 air, it makes everyone drowsy. I'd set the threshold for "ok" or "good" air to 600 ppm or so. But I'm not a scientist, just a

I've had meetings in a 800 ppm CO2 air, it makes everyone drowsy. I'd set the threshold for "ok" or "good" air to 600 ppm or so. But I'm not a scientist, just a programmer. Well, actually a data scientist but no experience in biology or health care.