Abstract
Expired air consists chiefly of watery vapor, carbonic dioxid (CO 2 ), and organic matter. CO 2 in large quantities is a deadly poison, and popular opinion looks upon this as the dangerous element in foul air. But specialists do not deem the CO 2 even in the worst ventilated rooms really dangerous.... What then constitutes the danger from foul air? It is the organic matter present in it. lungs and skin exhale a powerful poison. quantity is very small, but where two or three persons are together in a confined space, it is sufficient to infect the air quickly. While the exact nature of this organic matter is a subject of dispute, it is evident that the human miasma is the really dangerous element in expired air. The amount is generally proportional to the amount of expired air, and the CO 2 measures the amount of expired air.
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