Researchers believe that high levels of CO2 in the classroom as a result of poor ventilation in schools can cause students to become drowsy. The data illustrated in these two graphs was gathered from a classroom with a volume of 10, 764 ft3 using a Logger Pro carbon dioxide sensor. The CO2 sensor was plugged into a laptop and left in the classroom for a given period of time to consistently record the amount of carbon dioxide in parts per millions.
The first graph depicts the data collected during an experiment in which the level of CO2 in the classroom was collected consistently from when the school day ended until the following morning. The second graph illustrates the data collected during an experiment in which the level of CO2 in a classroom was measured consistently throughout an entire school day. While the second graph shows that the level of CO2 in a classroom decreases when no one inhabits the classroom, the first graph demonstrates that the level of CO2 in a classroom increases when students are in the classroom. The decrease of CO2 in the classroom when classes are not in session, as shown in both graphs, implying that CO2 levels can decrease in a short amount of time when the room is uninhabited.
Thus, the data show that the level of CO2 in the room increases when classes take place; however, CO2 levels can be managed by limiting the number of classes that occur in a classroom and ensuring that these classes do not occur consecutively. By limiting the level of CO2 in the classroom, schools may be able to decrease student drowsiness during the day.
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