From Wikipedia:
The air we inhale is
The air we exhale is
Not sure if that is significant or not. My guess is that the CO2 levels in our houses might already be higher than that.
The air we inhale is
- 78.62% nitrogen
- 20.84% oxygen
- 0.96% argon
- 0.04% carbon dioxide
- 0.5% water vapour
The air we exhale is
- 78.04% nitrogen
- 13.6% - 16% oxygen
- 4% - 5.3% carbon dioxide
- 1% argon and other gases
Not sure if that is significant or not. My guess is that the CO2 levels in our houses might already be higher than that.

