Oxygen and Human Requirements
% Atm Oxygen |
% sea level Oxygen |
||
23.5% |
112% |
Maximum permissible oxygen level. | No effect. |
21% |
100% |
Percentage of oxygen found in normal air. | No effect . |
19.5% |
93% |
Minimum permissible oxygen level. | No effect. |
15% |
71% |
Decreased ability to work strenuously. | May impair coordination and may induce early symptoms with individuals that have coronary, pulmonary, or circulatory problems. |
12% |
57% |
Respiration and pulse increase. | Impaired coordination, perception, and judgment occurs. |
10% |
48% |
Respiration further increases in rate and depth. | Poor judgment and bluish lips occur. |
8% |
38% |
8 minutes - 100 percent fatal; 6 minutes - 50 percent fatal; 4-5 minutes - recovery with treatment. | |
6% |
29% |
Coma in 40 seconds, convulsions, respiration ceases - death. |