A person may develop carbon dioxide poisoning in a number of situations.
Environmental release of carbon dioxide:
(1) "killer lakes" (release of accumulated carbon dioxide from volcanic lakes or under the ocean)
(2) melting of dry ice
(3) release of carbon dioxide from a gas cylinder
Since carbon dioxide is relatively dense the concentration after an environmental release is higher near the ground. Someone above the ground may survive while a person near the ground may not.
Diving or closed space environment:
(1) diving with a rebreather circuit
(2) skip breathing (voluntary hypoventilation) while diving
(3) hard hat diving
(4) being in a caisson, space capsule or other closed chamber
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