Posted by christy on Friday, January 22, 2010 at 6:17am.
My suggestion would be CO2
The air we breathe in contains about 0.04% carbon dioxide.
The air we breathe out contains about 4% carbon dioxide.
In other words, exhaled air contains about 100 times the concentration of carbon dioxide that inhaled air does.
There is a corresponding but small change in the O2 content.
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