The Oxygen toxicity reference article from the English Wikipedia on 24-Jul-2004
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Oxygen toxicity

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Oxygen is toxic at elevated partial pressures and oxygen toxicity can therefore occur whenever the oxygen partial pressure is substantially elevated for more than a few hours. Oxygen toxicity is a diving disorder and also a potential complication of mechanical ventilation.

When diving, oxygen toxicity maybe caused by breathing any breathing gas at the high pressure of depth.

In humans, there are several types of oxygen toxicity: