The term anoxia means a total decrease in the level of oxygen, an extreme form of hypoxia or "low oxygen". The terms anoxia and hypoxia are used in various contexts:

• Anoxic waters
• Anoxic event
• Dead zone (ecology) or hypoxic zones
• Hypoxia (environmental)
• Hypoxia (medical)

[edit] See also

• Oxygen saturation, a relative measure of the oxygen dissolved or carried in a medium; a measure of the severity of hypoxic conditions.
• Oxygen toxicity (hyperoxia), the opposite condition of hypoxia, an excess of oxygen in body tissues.

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