Asphyxia or asphyxiation was a condition of severely deficient supply of oxygen to the body that arose from abnormal breathing.
When Tom Paris operated a 1936 Ford truck in a USS Voyager cargo bay in 2371, the resulting in high levels of smoke caused Tuvok to suggest increasing the ventilation before everyone was asphyxiated. (VOY: "The 37's")
When the air was sucked out of Voyager's bridge by a Class J nebula lifeform in 2376, Captain Janeway was almost asphyxiated as she attempted to reroute emergency power to environmental controls. (VOY: "The Haunting of Deck Twelve")