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OSHA Definition;
Oxygen deficiency means that concentration of oxygen by volume below which atmosphere supplying respiratory protection must be provided It exists in atmospheres where the percentage of oxygen by volume is less than 195 percent oxygen Oxygen deficiency means that concentration of oxygen by volume below which atmosphere supplying respiratory protection must be provided It exists in atmospheres where the percentage of oxygen by volume is less than 195 percent oxygen
1910134(i)(1)(ii)(A)
Oxygen content (v/v) of 195-235%
1910134(i)(1)(ii)(D)
Carbon dioxide content of 1,000 ppm or less