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Geosmin ( ) is an irregular sesquiterpenoid with a distinct earthy or musty odor, which most people can easily smell. The geosmin odor detection threshold in humans is very low, ranging from 0.006 to 0.01 micrograms per liter in water. Geosmin, along with 2-methylisoborneol, are the major biological causes of taste and odor outbreaks in drinking water worldwide and in farmed fish.

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