Plain English Meaning

A gas you can't see or smell. People breathe it out, engines produce it, and dry ice releases it as it warms up. Too much of it in a closed space pushes oxygen aside and makes you sick or kills you.

Full Definition

A colorless, odorless, non-flammable gas produced by combustion, exhalation, and the sublimation of dry ice. In an aircraft cabin, elevated CO2 displaces oxygen and, at sufficient concentrations, causes drowsiness, headache, impaired judgment, unconsciousness, and death.

Context Anchor

Seen when planning to carry dry ice in an aircraft, especially in baggage, cargo, or any area with limited fresh air flow.