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The objective was to find an eco-friendly method to do so. Thus the living walls, and not just outdoor air intake (which would cost power to run the fans, similar to the energy footprint of running an AC). I can't comment on average outdoor air, but plants certainly helped.

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Were the visual and odor aspects hidden from the participants? If you put some monkeys in a blank white room to do some tasks and some others in a room with visible Flora and the smell of Earth and plants, I suspect the lattre group would perfo better even with O2 an CO2 levels constant.

Sorry.. I meant do expirements measuring cognitive performance relative to co2, find an optimal level, and if so is that level what you'd typically get outdoors?

I didn't mean "why don't you just open a window."

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