I ran a CO2 monitor in my classroom and found it exceeded 2000ppm on some occasions. Typically it would be 1200-1600. I discussed this with architects when buil

I ran a CO2 monitor in my classroom and found it exceeded 2000ppm on some occasions. Typically it would be 1200-1600. I discussed this with architects when building a new facility, and the new facility tests at <900ppm fully occupied. I think the high levels before led to worse behavior and lower academic performance. Both seem generally better now.