The nights became colder so we started closing the window during night. This brought the topic of measuring Indoor CO2 again in scope. Motivated by this research, i decided to try and close also the room door it and monitor what happens with CO2 Levels during the night. As you know elevated levels of Carbon Dioxide can result in headaches and bad sleep. You can find an interesting read about this here.
Or bedroom is ~16 m2, part of a 120 m2 apartment and usually we do not close our door. The apartment is free and we do not have lot’s of flowers inside, so the CO2 Level in the evenings is ~800 PPM. On the chart below you can see the changes in CO2 based on the occupancy of the room and whether the doors or windows are shut or open.
While I was expecting it would rise, i was quite surprised to see the rate in which CO2 rises. On the chart below i have estimated it at ~430ppm/h.
Time-Graph of CO2 PPM Level while sleeping in a closed room
What you can clearly see on the chart is how each change in the rooms occupation affects the CO2 Level quite quickly. Also what is astonishing is that we passed 2000 ppm at ~1 am. This is just 2 hours after we went to sleep in a relatively fresh air.
At 4.30am i woke up (i usually wake up then) and the air felt quite stuffy (maybe also because i Knew the PPM). But then i decided to open the door wide and give my wife and baby some fresh air.
If i had left the door shut, the level would have easily reached 4500 ppm until 7am.
The next test that i am about to do is to try keeping the door just 10-20cm open. This is how it how it usually stays. Some quick observations from last nights showed that also in the case CO2 was rising, though not that fast.