# What Is the Percentage of Oxygen in the Air?

## Answer

Oxygen in the air is 20.946%. The air is exhaled from the lungs contains 14% oxygen and 4.4% carbon dioxide. The atmospheres with less than 16 percent oxygen can become life threatening.
Q&A Related to "What Is the Percentage of Oxygen in the Air"
 Air is only about twenty one percent Oxygen. Air also contains about seventy eight percent Nitrogen. There are tons of different uses for Oxygen. http://answers.ask.com/Science/Chemistry/what_perc...
 21% http://wiki.answers.com/Q/What+is+the+percentage+o...
 The air that we breathe consists of 21 percent oxygen. http://www.chacha.com/question/what-percentage-of-...
 78% Nitrogen. 20.5% Oxygen.5% Argon. 1% Other. So about 21% Source(s) SCUBA diving certification requirements. http://answers.yahoo.com/question/index?qid=200805...
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