Safe oxygen levels for personnel fall within which percentage range?

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Multiple Choice

Safe oxygen levels for personnel fall within which percentage range?

Explanation:
The safe oxygen range is set to keep breathing air both comfortable and non-hazardous in damaged or enclosed spaces. Too little oxygen can quickly impair thinking and physical ability, while too much oxygen increases the risk of fires and explosions in already compromised environments. So, a breathable range around 19.5% to about 22% balances staying above the hypoxic threshold with limiting oxygen enrichment that could fuel fires. The other options either drop below the safe minimum or raise the upper limit beyond what is considered safe, making them less appropriate.

The safe oxygen range is set to keep breathing air both comfortable and non-hazardous in damaged or enclosed spaces. Too little oxygen can quickly impair thinking and physical ability, while too much oxygen increases the risk of fires and explosions in already compromised environments. So, a breathable range around 19.5% to about 22% balances staying above the hypoxic threshold with limiting oxygen enrichment that could fuel fires. The other options either drop below the safe minimum or raise the upper limit beyond what is considered safe, making them less appropriate.

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