What is the normal CO2 outside?
The normal CO2 level outside is between 300-400 PPM. Some Co2 Monitors tell you to test the CO2 meter by taking it outside & test the outside CO2 level.
The normal CO2 level outside is between 300-400 PPM. Some Co2 Monitors tell you to test the CO2 meter by taking it outside & test the outside CO2 level.