3 ms·
Considering atmospheric CO2 levels are around 400ppm you're not going to keep it that low indoors unless it's full of open windows.
by driverdan 6y ago
Considering atmospheric CO2 levels are around 400ppm you're not going to keep it that low indoors unless it's full of open windows.
- graeme 6y agoYup. I have all of my windows open right now, it’s summer. Co2 tends to be around 500. Even outdoor city air in my location is more like 450, though of course my meter could be biased high.
- function_seven 6y agoThat’s what I was getting at. 400 is the lower bound, if you have many windows open on a breezy day in the country. The tear emoticon was a nod to how high that baseline is.