>[!abstract]
>The nitrogen in ambient air slightly but measurably impairs human performance compared with a non-anesthetic gas such as helium ([[Winter et al., 1975]]).
>[!related]
>- **North** (upstream): [[Hyperbaric medicine]]
>- **West** (similar): —
>- **East** (different): [[Normoxic breathing]] (surface-level gas balance without narcotic effects)
>- **South** (downstream): —