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According to Wikipedia;

The atmosphere on Mars consists of 95% carbon dioxide, 3% nitrogen, 1.6% argon, and contains traces of oxygen, water, and methaneThe atmosphere on Mars consists of 95% carbon dioxide, 3% nitrogen, 1.6% argon, and contains traces of oxygen, water, and methane.

In addition, the average surface pressure is about one seventeenth of that of earth, although the atmosphere is on average 11 kilometres thick, in comparison to 7 for earth.

The planets low gravity prevents it from ever accumulating a much denser atmosphere for any significant amount of time.

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15y ago

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