Multiple choice general knowledge

Which gas is the most common culprit in “deadly farts”?

  1. N2

  2. O3

  3. H2S

  4. CO2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hydrogen sulfide (H2S) is the primary gas responsible for the unpleasant odor in farts. Even though it's present in very small concentrations (typically less than 1%), its extremely low odor threshold means we can detect it at parts per billion levels. Nitrogen (N2) is odorless, ozone (O3) is not a normal component of flatulence, and CO2 has no smell.

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