| Summary: | Although carbon dioxide (CO2) is a gas not perceived by human, extremely high concentration of CO2 has an influence on the human’s health. High concentration of CO2 also leads to lowering concentration ability and promoting drowsiness. It may also have an influence on productivity and learning efficiency of human. We conducted experiments to measure the amount of workability and the physiological and psychological response of the subjects. In the experiment, the concentration of CO2 was set at the constant level at each case. And then, the concentration of CO2 was changed to examine the physiological and psychological response. In the result of the experiment, the CO2 concentration had the influence on productivity and working efficiency of human. Even if the CO2 concentration is not so high, physiological condition of the human would be also affected.
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