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RRCAT_Indore Government of India | Department of Atomic Energy
Raja Ramanna Centre for Advanced Technology 		RRCAT_Indore
Cryogenics Activity
Physiological Effects and Recommended Exposure Limits of Nitrogen

16 - 25 % of oxygen by volume is Acceptable. Asphyxia due to oxygen deficiency is often rapid with no prior warning to the victim. A general indication of what is liable to happen is given in the table below but it should be appreciated that the reactions of some individuals can be very different from those shown.
Oxygen Content(Vol %)Effects and Symptoms (at atmospheric pressure)
11-14 Diminution of physical and intellectual performance without person's knowledge
8 - 11Possibility of fainting after a short period without prior warning
6 - 8Fainting within a few minutes; resuscitation possible if carried out immediately
0 - 6Fainting almost immediate death ensues; brain damage even if rescued
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