Assertion: diver's pressure | /r/CapableOf | reach approximately 4.0 ata
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text: Helitrox/triox proponents argue that the defining risk for air and nitrox diving depth should be nitrogen narcosis, and suggest that when the partial pressure of nitrogen reaches approximately 4.0 ATA, which occurs at about 130 feet (40 m) for air, helium is necessary to limit the effects of the narcosis.