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What's the view on the immediate impact on elevated CO2 levels on humans? I know high indoor CO2-levels correlate with poor mental performance, but as far as I know that might just be because it also correlates with reduced O2 levels. But it seems reasonable that a 25% increase of CO2 in ambient air would do something to our health.

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Here are a couple of controlled studies:

https://ehp.niehs.nih.gov/doi/10.1289/ehp.1104789

https://ehp.niehs.nih.gov/doi/10.1289/ehp.1510037

Cognitive impairment seems to get really noticeable at ~1000 ppm.

No problems outdoors but my worry there is that being inside can easily more than double CO2. Even with a window cracked slightly. So we're ok if we have really good ventilation. A fan makes us safe. At <300PPM we would have had far less to worry about here.

As CO2 reaches over 500PPM (this is not that far away) that doubling of CO2 levels from being indoors puts us in the cognitive impairment range. Not good.

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