Outside air has a carbon dioxide, or CO2, level of about 427 parts per million (ppm), but that percentage can get much higher in closed spaces. As CO2 increases, brain function suffers, with school-age children more vulnerable than adults. At CO2 levels over 1,000 ppm, common effects include sleepiness, reduced productivity, and significant declines in the ability to perform complex cognitive tasks. In one study, adults subjected to CO2 levels of 1,000 ppm saw a 15% drop in test scores; a 44% drop occurred at CO2 levels of 2,500 ppm. High CO2 makes you dumber!
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