However, the difference between ventilation types is quite significant: MV classrooms have an average weekly increase in CO 2 level of 0.4%, when compared with a 0.8% weekly increase for NV classrooms—it seems that teacher behavior is such that windows and doors are increasingly closed again, as time since the school closing progresses.
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The effect of post-COVID-19 ventilation measures on indoor air quality in primary schools.
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