What are the fumes from growing beer yeast and is there any adverse toxic problems?

  • DO you mean yeast growing in a starter? Or do you mean yeast fermenting a batch in a bucket or carboy? It doesn't matter but I am curious.
    – brewchez
    Oct 8, 2014 at 11:13

1 Answer 1


You are smelling esters, aldehydes and sulfides at different levels. There are a host of many other compounds that might be coming out too.

It is not harmful.

  • 3
    Also, uh, CO2. :)
    – jsled
    Oct 8, 2014 at 13:14
  • 1
    CO2 doesn't have an aroma really. It'll burn your nostrils if you get a good face full of it, but otherwise its odorless.
    – brewchez
    Oct 8, 2014 at 14:21
  • @brewchez mentioned sulfides. They can smell like rotten eggs. They are prominent in lager brewing and be a big surprise when you open your fermentation chamber/cupboard and that smell attacks you! :) Remember, if you can smell it then in is no longer in your beer. Oct 9, 2014 at 6:47

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