Normal atmospheric oxygen percentage?

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Multiple Choice

Normal atmospheric oxygen percentage?

Explanation:
Oxygen makes up about one-fifth of the air we breathe. In dry air at sea level, the typical value is about 21 percent by volume (roughly 20.95%). The rest is mostly nitrogen with small amounts of other gases. This is the standard reference for normal atmospheric air, and it’s the reason that 21 percent is the best answer. Values notably lower would mean oxygen-deficient air and potential hypoxia, while values much higher would indicate an unusually rich-oxygen environment, which isn’t characteristic of normal air.

Oxygen makes up about one-fifth of the air we breathe. In dry air at sea level, the typical value is about 21 percent by volume (roughly 20.95%). The rest is mostly nitrogen with small amounts of other gases. This is the standard reference for normal atmospheric air, and it’s the reason that 21 percent is the best answer. Values notably lower would mean oxygen-deficient air and potential hypoxia, while values much higher would indicate an unusually rich-oxygen environment, which isn’t characteristic of normal air.

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