Atmosphere
| Viking atmospheric measurements[1] | |
| 95.32% | Carbon dioxide (CO2) |
| 2.7% | Nitrogen (N) |
| 1.6% | Argon (Ar) |
| 0.13% | Oxygen (O2) |
| 0.07% | Carbon monoxide (CO) |
| 0.03% | Water vapor (H2O) |
| trace | Neon (Ne), Krypton (Kr), Xenon (Xe), Ozone (O3), Methane (CH4) |
Mars surface pressure: 1-9 millibars (depending on altitude).
References
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