Atmosphere

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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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