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Clarification of OSHA's requirement for breathing air to have at least 19.5 percent oxygen content
"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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