I saw it described as inert and non-toxic.
Maybe it's got something to do with
Quote:
https://www.britannica.com › science › Avogadros-law
Avogadro's law | Definition, Explanation, & Facts | Britannica
Avogadro's law states that equal volumes of different gases contain an equal number of molecules under the same conditions of temperature and pressure. The specific number of molecules in one gram-mole of a substance is Avogadro's number, or 6.02214076 × 10 23.
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They're having to deal with tons of the stuff.