Re: [Space] "Mildly" Toxic
The air in Mexico City on bad days probably qualifies as "mildly toxic". It kills people, that's for sure. The worst of the London Smogs were definitely "mildly toxic" if not worse - coal burning is ick.
To be suffocating, it would have to be entirely lacking in oxygen, or have compounds in it that prevent oxygen absorption (carbon monoxide frex).
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