When something “smells moldy” what are we really smelling?

When something “smells moldy” what are we really smelling?

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When things smell moldy -- it could be clean clothes left in a heap, a damp basement, old books stored in elevated humidity -- they can smell moldy.

There are distinct smells for each of these.

Are we smelling the mold spores themselves, or are there other molecules released by molds that causes the "moldy smell" we perceive?

The vast majority of the things you smell are odorants, or volatile molecules; not spores. They are light compounds that have high vapor pressure (are airborne), and that interact with your chemoreceptors in your nose (can be smelled). The most-often reported microbial volatile organic compounds in living environments according to this study are as follows:

  • 2-Methyl-1-propanol
  • 3-Methyl-1-butanol
  • 3-Methyl-2-butanol
  • 2-Pentanol
  • 3-Octanol
  • 1-Octen-3-ol
  • 2-Octen-1-ol
  • 3-Methylfuran
  • 2-Hexanone
  • 2-Heptanone
  • 3-Octanone
  • 2-Methylisoborneol
  • 2-Isopropyl-3-methoxy-pyrazine
  • Geosmin
  • Dimethyl disulphide

Geosmin is probably the most moldy-smelling and is detected very sensitively by olfactory systems of animals that want to avoid contaminated food. To me it smells muddy, or earthy, like soil after a rain shower. In our lab, about half the people find it a pleasant smell. It can be smelled in wine, it's the earthy taste found in vegetables, it's the smell of dead bacteria, and so on and so on. The term petrichor describes the odor and geosmin is a major contributing odorant for this.


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  2. Mel

    I would not say using this approach and logic, you can come to such delirium. So, it's not worth it, it's not worth it ... But, in general, thanks, it's really interesting and there is something to think about. All happy holidays and more bright ideas in NG !!!!! Let's light up the 31st!

  3. Zuktilar

    Bookmarked it.

  4. Vudokora

    There's something about that, and I think it's a great idea.

  5. Spencer

    the nice question

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