Yes, the human nose has evolved sensitivity to sulfide substances produced by bacteria that spoil food. For example, the humans can barely smell 0.001ppm of di

Yes, the human nose has evolved sensitivity to sulfide substances produced by bacteria that spoil food. For example, the humans can barely smell 0.001ppm of dimethyl sulfide (from decomposing vegetables) and 1ppm of formaldehyde [0]. Human noses are three orders of magnitude more sensitive to the relatively safe dimethyl sulfide than to the dangerous formaldehyde. Formaldehyde can harm you even when you can't smell it (at 0.1ppm [1]). [0] https://www.tandfonline.com/doi/pdf/10.1080/00022470.1969.10466465 https://www.tandfonline.com/doi/pdf/10.1080/00022470.1969.10... [1] https://en.wikipedia.org/wiki/Formaldehyde#Safety https://en.wikipedia.org/wiki/Formaldehyde#Safety