What gaseous substances do humans emit?

Question

Other than CO₂ and Methane what other gases do humans produce or emit?
For example, does  skin decomposition, or aerobic respiration emit any special gases that people don't normally realize or know about.
I ask because of a discovery I made during research is that while being poisonous to the central nervous system, methanol is a natural endogenous compound found in normal, healthy human individuals.
One study found a mean of 4.5 ppm in the exhaled breath of the subjects. https://iopscience.iop.org/article/10.1088/0967-3334/27/7/007

aliential · Accepted Answer

There are 100+ gas phase compounds that come from humans.

Find other information about most of these families of compounds from wiki.
Full list of compounds is here
Methods and findings are here

R Stephan · Answer

The gases NO, H₂S, CO even have a function in the human body!

Nitric oxide is produced in endothel and neurons as messenger, and in macrophages as cause of nitrosative stress for imprisoned bacteria. Hydrogen sulfide is produced in cysteine catabolism and functions as messenger (only recently discovered). Carbon monoxide appears to act as messenger, too.

http://en.wikipedia.org/wiki/Biological_functions_of_nitric_oxide

http://en.wikipedia.org/wiki/Hydrogen_sulfide#Function_in_the_body

Wu, L; Wang, R (December 2005). "Carbon Monoxide: Endogenous Production, Physiological Functions, and Pharmacological Applications". Pharmacol Rev 57 (4): 585–630. doi:10.1124/pr.57.4.3. PMID 16382109

Mark · Answer

H₂O is emitted through respiration and perspiration.

user338907 · Answer

A key component of body odour is the volatile thioalcohol, 3-methyl-3-sulfanylhexan-1-ol (3M3SH).  The structure may be visualized as hexan-1-ol  "substituted by a methyl group and a thiol group at position 3 " (pubchem)
A major contributor to the formation of 3M3SH is the  commensal bacterium, Staphylococcus hominis,  which produces it  as a by-product of the metabolism of  (odourless)  Cys-Gly-3M3SH.
Cys-Gly-3M3SH, "an L-cysteinylglycine dipeptide-conjugated alcohol that is secreted onto the surface of the skin by apocrine  glands" (Ref 2), is itself produced as a by-product of human metabolism in sweat glands.
The key enzyme is a cysteine-thiol lyase (C-T lyase), which (among many other interesting attributes), contains pyridoxal phosphate.
References
Ref 1: Structural basis of malodour precursor transport in the human axilla (Minhas et al., 2018)
Ref 2: The molecular basis of thioalcohol production in human body odour  (Rudden et al., 2020; Nature (Scientific Reports))
Ref 3: Know sweat: scientists solve mystery behind body odour (The Guardian, July 2020)
Ref 4: Structure of 3M3SH at pubchem.

What gaseous substances do humans emit?

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