In a large space where someone is in close proximity to an emitter and there’s little active or passive mixing. CO2 will generally diffuse more evenly throughout a space than aerosols.
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But importantly, it takes longer for CO2 to reach its steady state in a large space. Someone could be in a poorly ventilated space for a while before CO2 reveals poor ventilation.
You could also argue that a larger space/higher ceilings is somewhat protective as aerosols have more room to dilute into, but as mentioned they won’t necessarily dissipate as quickly as CO2.
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