Why do fart smell bad?

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Farts smell bad because the air in a fart has to rush past your doodoo to get out.

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Farts contain sulfur dioxide, a very smelly chemical that gives a fart its smell.

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The gases in a fart are composed of 99.2% of odorless gases and minuscule amounts of ammonia, hydrogen sulfide and excrement (these total 0.8% of a fart's composition). However, our nose is extremely sensitive to these componets: we can smell them at 1 part per 100 million parts of air.

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