Nitrogen - 78.084%
Oxygen - 20.946%
Argon - 0.934%
Carbon dioxide - 0.033%
Neon - 18.18 ppm (parts per million)
Helium - 5.24 ppm
Methane - 2 ppm
Krypton - 1.14 ppm
Hydrogen - 0.5 ppm
Nitric oxide - 0.5 ppm
Xenon - 0.087 ppm
On the average, air molecules are moving about 1000 mi/hr!
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