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Netatmo air quality sensor CO2 readings everywhere.

Netatmo air quality sensor CO2 readings everywhere.

I just took out my Netatmo air quality sensor and immediately took the 1600 read CO2 sensor out of the box and glided there for a few hours. Overnight in the bedroom increased to 2800 and this morning decreased to 500. I live above a highway in an old leaky apartment. How should automatic calibration work if I don’t even know what the correct CO2 reading is? Any idea?