I never had access to co2 meters when I was a teenager, but I had the same suspicion. Some rooms regularly left me feeling stifled & drowsy, and the first breat

I never had access to co2 meters when I was a teenager, but I had the same suspicion. Some rooms regularly left me feeling stifled & drowsy, and the first breath of fresh air out the door would rouse me in an instant. I plan on sending my own kids to school with a meter one day just to see. The reason I don't believe it was just boredom is the worst offender was always choir- a class I loved, and a class with obviously elevated production of co2.