co2 by itself doesn't appear to really matter: https://news.ycombinator.com/item?id=19863319 https://news.ycombinator.com/item?id=19863319 key phrase being "Th

co2 by itself doesn't appear to really matter: https://news.ycombinator.com/item?id=19863319 https://news.ycombinator.com/item?id=19863319 key phrase being "There's a big difference between seeing high concentrations of carbon dioxide as indicative of poor ventilation and seeing high concentrations of carbon dioxide itself as detrimental to cognitive function."