90. What is the danger to personnel associated with using carbon dioxide in an enclosed space?

Carbon dioxide displaces oxygen in an enclosed space, creating an asphyxiation hazard. This occurs because the gas lowers oxygen levels below breathable limits, potentially leading to unconsciousness and death. Carbon dioxide is non-explosive, does not cause skin burns, and frostbite is a localized hazard, not the primary danger associated with its use in an enclosed space.