vitiated air

vi·ti·at·ed air

air containing a reduced percentage of oxygen.
Farlex Partner Medical Dictionary © Farlex 2012
References in classic literature ?
When the time came, he gave up his apparatus to another and returned to the vitiated air on board, calm, unflinching, unmurmuring.
By these two means they would be enabled to restore to the vitiated air its life- supporting properties.
Transverse ventilation uses both a supply duct system and/or an exhaust duct system to uniformly distribute supply air and/or collect vitiated air throughout the length of the facility.
This atrium introduces daylight into the centre of the library, gives legibility to the vertical circulation, and ventilates vitiated air upwards out of the building, contributing to the building's impressive environmental rating.