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> Naturally ventilated airports would probably have issues with fumes.

I'm confused. Do you mean from the food places? Those need proper extraction anyway. Or the cars/planes? Then mechanically ventilated airports take the air basically from outside anyway.

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> Then mechanically ventilated airports take the air basically from outside anyway.

This is not how A/C works.

Depends on whether an ERV/HRV or other fresh air intake system is involved, I guess. In a space like an airport with so many people, you do have to cycle in fresh air somehow, it can’t just be a sealed space.

Fair point

No, that's how ventilation works. They can be independent and you need both. Closed loop A/C provides no ventilation.

I don't disagree

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