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Amount of $\mathrm{CO}_2$, in expired air is about
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$4.5 \%$
Amount of $\mathrm{CO}_2$ in expired air is $4.4 \%$. The air we breathe in contain about $0.04 \% \mathrm{CO}_2$. The air we breathe out contains about $4 \% \mathrm{CO}_2$. In other words, exhaled air contains about 100 times the concentratioon of $\mathrm{CO}_2$ that inhaled air does.
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