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What's the concentration level of oxygen in a standard medical oxygen gas which is normally found in ambulances or hospitals? Does it contain nitrogen too?

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Medical oxygen in liquid or compressed cylinders is typically >99% O2, but it is not typically administered at full strength. Instead, patients inspire a mixture of O2 and room air.

Oxygen concentrator units concentrate to 90-96%, which is called "93% oxygen". The remainder is mostly nitrogen.

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