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Another possible explanation could be that the ventilation device appeared to have not enough capacity to lower CO2 concentration to 800 ppm during classroom occupation.
All data reported in this paper are restricted to periods of actual classroom occupation excluding breaks and periods when students were elsewhere (e.g. gym).
Mean indoor CO2 concentrations, temperature and relative humidity during classroom occupation per school per week are presented in Tables 2, 3 and 4.
Two studies performed in The Netherlands in 2007 showed that more than 80% of the schools exceeded CO2 levels of 1200 parts per million (ppm) during classroom occupation [ 2, 3], which in The Netherlands is the advised maximum CO2 concentration for classrooms [ 4, 5].
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I had the luxury of an 8 00 am class with no prior class to prevent my occupation of the classroom.
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Some came across the bay from UC Berkeley where they had joined about 200 others in an overnight occupation of the Wheeler Hall classroom building in protest against the hikes.
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Even after blistering American airstrikes that killed a large number of prisoners, some remained holed up in the basement of a square, brick classroom building built by the Soviets during their decade-long occupation of Afghanistan in the 1980's.
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