Poisonous and Irrespirable gases.
"Aids to Forensic Medicine and Toxicology"
W. G. Aitchison Robertson
May the ghosts of the men who mar the earth, turning her sweet rivers into channels of filth, and her living air into Irrespirable vapours and pestilences, haunt the desolations they have made, until they loathe the work of their hands, and turn from themselves with a divine repudiation.
"Malcolm"
George MacDonald
The abstract ideas of which the air consists, indispensable for life, but Irrespirable by themselves, as it were, and only active in their re-directing function.
"Pragmatism A New Name for Some Old Ways of Thinking"
William James