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Nitrogen (N2) ~78%

Oxygen (O2) ~ 21%

Argon (Ar) ~0.9%

Carbon Dioxide (CO2) ~ 0.04%

Neon (Ne) ~ 0.02%

Remainder < 0.001%

Oh, don't forget:

Water (H2O) highly variable! Maximum is ~2% at 25C

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13y ago

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