Fascinating Fart Facts -- Wafting Through Great Moments of Wind

Blowing in the Wind

Flatulence is composed of approximately three-fifths nitrogen, one-fifth hydrogen, one-tenth carbon dioxide, and small amounts of methane and oxygen -- all of which are essentially odorless. The joy comes from trace amounts of other chemicals, especially ammonia, hydrogen sulfide and skatole (excrement), which people can smell at levels of 1 part per 100 million parts of air.

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