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Previous studies have shown that poorly ventilated classrooms can have   negative impact on the health of children and school staff. In most cases,   schools in Serbia are ventilated naturally. Considering their high occupancy,   classroom air quality test determines the level of air pollution, after which   it is possible to implement corrective measures. The research presented in   this study was conducted in four schools which are located in different areas   and have different architecture designs. Measurements in these schools have   been performed during the winter (heating season) and spring (non-heating   season) and the following results were presented: indoor air temperature,   relative humidity and carbon dioxide concentration. These results show that   the classroom average concentration of carbon dioxide often exceeds the value   of 1500 ppm, during its full occupancy, which indicates inadequate   ventilation. Measurement campaigns show that carbon dioxide concentration   increased significantly from non-heating to heating season in three of the   four schools. Analysis of measurements also determined high correlation   between relative humidity and carbon dioxide concentration in all schools in   winter season. This fact may constitute a solid basis for the fresh air   supply strategy. [Projekat Ministarstva nauke Republike Srbije, br. III42008:   SINPHONIE - Schools Indoor Pollution and Health: Observatory Network in   Europe

Impact of CO2 concentration on indoor air quality and correlation with relative humidity and indoor air temperature in school buildings in Serbia