Answer 1:
1. 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.
reference
2. Wikipedia's Breathing article says we
exhale this much CO2:
4% - 5.3% carbon dioxide
3. Compared to the low levels of about 0.04
percent in inspired air, exhaled air contains a
hundred times more CO2, at 4 percent
content.
read here
That seems to answer it.
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