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Name: Ash
Status: other
Age: other
Location: PA
Country: N/A
Date: 12/13/2005


Question:
How much oxygen is needed to remain in the air before a person goes unconscious?


Replies:
This would vary greatly depending upon the condition of the person.

The following site offers an approximation:

http://ehs.ucdavis.edu/hs/ConfSpace/index.cfm

* 20.9-23.5 percent: Maximum permissible oxygen level. No effect.

* 20.9 percent: Percentage of oxygen found in normal air. No effect.

* 19.5 percent: Minimum permissible oxygen level. No effect.

* 15-19 percent: Decreased ability to work strenuously. May

impair coordination and may induce early symptoms with individuals that have coronary, pulmonary, or circulatory problems.

* 12-15 percent: Respiration and pulse increase; impaired coordination, perception, and judgment occurs.

* 10-12 percent: Respiration further increases in rate and depth; poor judgment and bluish lips occur.

* 8-10 percent: Symptoms include mental failure, fainting, unconsciousness, an ash-colored-face, blue lips, nausea, and vomiting.

* 6-8 percent: 8 minutes - 100 percent fatal; 6 minutes - 50 percent fatal; 4-5 minutes - recovery with treatment.

* 4-6 percent: Coma in 40 seconds, convulsions, respiration ceases - death.

Steve Sample


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