The atmosphere a person is in — its gas composition and fraction, the pressure it is delivered at, and the suspended phase carried in inhaled air. This family holds the atlas's strongest anchor, HBOT, beside frontier work (IHHT), a narrow-use high-caution case (ozone / EBOO), and — widened in this taxonomy — airborne interventions whose carrier is the inhaled atmosphere itself: dry-salt aerosol (halotherapy) and environmental air ozonation. Membership is by carrier, not by whether the agent is a gas; the lever is a measurable physical one — partial pressure, oxidative dose, a hypoxic stimulus, an inhaled aerosol — never a “field” or a “frequency.”