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According to Is CO2 an Indoor Pollutant? Direct Effects of Low-to-Moderate CO2 Concentrations on Human Decision-Making Performance Environ Health Perspect. 2012 Dec; 120(12): 1671–1677: of 9 different cognitive tests performed at 600ppm (green), 1000ppm (blue) and 2500ppm (red) several show very marked decrease in scores at higher C02 concentration. ...

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