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Are Mars’ atmospheric CO2, O2 and CO in equilibrium? Are sunlight or chemical reactions involved?

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Questions › Are Mars’ atmospheric CO2, O2 and CO in equilibrium? Are sunlight or chemical reactions involved?
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Garmaine asked 3 years ago

According to the NASA JPL video linked below the top five gases comprising the martian atmosphere include CO₂, O₂ and CO. Do the proportions reflect some chemical equilibrium? Are sunlight or chemical reactions involved in maintaining these proportions?

component     fraction
   CO2          95.9%
   Ar            2.0%
   N2            1.9%
   O2            0.14%
   CO            0.06%

Mars Atmospheric gases composition

The NASA JPL video Crazy Engineering: Making Oxygen on Mars with MOXIE is linked in How many square meters of solar panel to power a MOXIE-like oxygen source per person?