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What is the composition of pure air?

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Quick Answer

By volume, dry air is 78.09 percent nitrogen and 20.95 percent oxygen, accounting for over 99 percent of the total volume. The remaining 1 percent is made up of argon, carbon dioxide, neon, methane, helium, krypton, hydrogen, xenon, ozone, nitrogen dioxide, iodine and trace amounts of carbon monoxide and ammonia.

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What is the composition of pure air?
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Water vapor is also present in air. Under very humid conditions, air can contain as much as 5 percent water vapor, though the amount is more commonly in the 1 to 3 percent range, making it the third most common component of air. Together, nitrogen, oxygen, water vapor and argon account for 99.998 percent of air by volume.

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