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What gas do you breath out?

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04/21/2010

The gases in gas we exhale are mostly carbon dioxide and 4% to 5% less oxygen than was inhaled. Additionally, vapors and trace gases are present: 5% water vapor, several parts per million (ppm) of hydrogen & carbon monoxide, 1 ppm of ammonia and less than 1 ppm of acetone, methanol, ethanol and other volatile organic compounds.