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What percent oxygen can humans breathe 2024?
Questioner：Zoe Martin 2023-06-06 13:40:25
The most authoritative answer in 2024
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Julian Ramos——Works at the International Telecommunication Union, Lives in Geneva, Switzerland.
Human beings must breathe oxygen . . . to survive, and begin to suffer adverse health effects when the oxygen level of their breathing air drops below [19.5 percent oxygen]. Below 19.5 percent oxygen . . . , air is considered oxygen-deficient.Apr 2, 2007read more >>+119962023-06-09 13:40:25
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