Gas toxicity during diving

[Justin Bieber]

Problems during diving can result from toxic effects of gases such as nitrogen, oxygen, carbon dioxide, and carbon monoxide.
(See also Overview of Diving Injuries.)
Air is a mixture of gases, mainly nitrogen and oxygen with very small amounts of other gases. Each gas has a partial pressure, based on its concentration in the air and on the atmospheric pressure. Both oxygen and nitrogen can have harmful effects at high partial pressures.

[Renato]

Various physiologic (eg, oxygen, nitrogen, carbon dioxide) and nonphysiologic (eg, carbon monoxide) gases can cause symptoms during diving.

(See also Overview of Diving Injuries.)