I have two true CO2 sensors in my room (SCD30, SCD41), and I can confirm the CO2 concentration rises to 2400-2900 ppm during the night. But it's very easy to ve

I have two true CO2 sensors in my room (SCD30, SCD41), and I can confirm the CO2 concentration rises to 2400-2900 ppm during the night. But it's very easy to vent, a draft will reset the concentration to background levels in a minute or so.