I agree. Many people essentially live in sealed boxes that only receive ventilation through cracks and the occasionally opened door or window. My home average

I agree. Many people essentially live in sealed boxes that only receive ventilation through cracks and the occasionally opened door or window. My home averages around 800 ppm and that is with a fresh air ventilation system that is constantly running to exchange the air. If I turn off the ventilation system, I measure CO2 levels over 1300 ppm within a matter of hours. CO2 levels above 950 ppm are associated with significant impairments to cognitive function.[1] [1] https://dash.harvard.edu/bitstream/handle/1/27662232/4892924.pdf?sequence=1 https://dash.harvard.edu/bitstream/handle/1/27662232/4892924...