A good example of this is geosmin, for which a typical sensitivity for the human nose is below 10 parts per trillion (10 parts in 10¹⁸ v/v) (ppt).
Source: wiktionary
Geosmin
//d͡ʒiˈɑz.mɪn//
Synonyms for "geosmin"
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3 total sentences available.
A. versicolor may be one of the major producers of the moldy smelling component, geosmin, in buildings (Bjurman and Kristensson 1992).
Source: wiktionary
Beetroots: The flavor is decisively characterized by the earthy note of geosmin
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.