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"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]."
https://www.osha.gov/laws-regs/standardinterpretations/2007-04-02-0
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2021-12-15
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43.27 KB
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876
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The download archive contains currently 65 Downloads. To date, these have been downloaded 56,790 times.
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