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jamie13 | 09:50 Thu 04th Jun 2009 | Science
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what are the main levels of carbon dioxide in the atmosphere
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Dry air contains roughly (by volume) 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.038% carbon dioxide, and trace amounts of other gases.

Air also contains a variable amount of water vapour, on average around 1%.
09:52 Thu 04th Jun 2009

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