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Argon is around 0.934 % so it is the most abundant trace gas.

Carbon dioxide is next at 0.039 % and neon at 0.00182 %; also other noble gases as He, Xe, Kr, Rn, vapours of water, carbon monoxide.

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13y ago
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6y ago

I think to xenon: 0,000009 %.

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Q: The most abundant trace gas in the atmosphere is?
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