I know we have some Boeing drivers here, so a question about air cabin quality and CO2.
Just did a trip to Maui. Flew YYC-OGG non-stop on the 737 MAX. Monitored CO2 with an Aranet4 device (
https://aranet.com/products/aranet4/). Cabin CO2 levels stayed at 2400-2600 (very high).
However on our return flights (OGG-YVR, YVR-YYC) we were on 737-800's and the CO2 levels on both flights were at 1400-1600.
Load factors were very close on all flights, almost completely full cabins. I have to admit that I was quite surprised that the newest aircraft had the highest CO2 levels. Wonder if there is any insight a Boeing driver (or any airline pilot) could give me.