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ppmv: parts per million by volume

Nitrogen (N2) 780,840 ppmv (78.084%)

Oxygen (O2) 209,460 ppmv (20.946%)

Argon (Ar) 9,340 ppmv (0.9340%)

Carbon dioxide (CO2) 390 ppmv (0.039%)

Neon (Ne) 18.18 ppmv (0.001818%)

Helium (He) 5.24 ppmv (0.000524%)

Methane (CH4) 1.79 ppmv (0.000179%)

Krypton (Kr) 1.14 ppmv (0.000114%)

Hydrogen (H2) 0.55 ppmv (0.000055%)

Nitrous oxide (N2O) 0.3 ppmv (0.00003%)

Carbon monoxide (CO) 0.1 ppmv (0.00001%)

Xenon (Xe) 0.09 ppmv (9×10−6%) (0.000009%)

Ozone (O3) 0.0 to 0.07 ppmv (0 to 7×10−6%)

Nitrogen dioxide (NO2) 0.02 ppmv (2×10−6%) (0.000002%)

Iodine (I2) 0.01 ppmv (1×10−6%) (0.000001%)

Ammonia (NH3) trace

Not included in above dry atmosphere:

Water vapor (H2O) ~0.40% over full atmosphere, typically 1%-4% at surface

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