The research was performed in terms of thelnternationalproject"SchoolEnvironmentand RespiratoryHealthofChildren" (SEARCH Ⅱ), which was conducted in 10 Europeancountries, including Ukraine. The project's part "Environmental monitoring in school buildings" aims to identify the relationship between the children comfort conditions and indoor air quality in classrooms. The indoor air monitoring in schools was performed using following methods: continuous sampling for measurement of PM10 (Haz-Dust EPAM-5000) and CO/CO2/T/RH (TSI IAQ); passive sampling to estimate formaldehyde, VOCs/BTEX and NO2 (RADIELLO passive samplers). For the project implementation 10 schools in different districts of Kyiv were selected. In each school 4 classes were chosen (100 students aged 9-11 years). The field study was performed during the heating period (February-April). The total sampling duration was 4 days: continuous sampling indoors - one day per classroom during working hours, outdoors - 20-30 minutes before and after classes every day; passive sampling indoors and outdoors - from first to last day. The study revealed that measured CO2 concentrations as high as up to 1000 ppm during the working hours; the temperature was going up from 18 oC during the morning hours to 25 oC by the end of the classes; the relative humidity was in the range from 30% to 45%. The measured concentrations of indoor air pollutants were within the range: BTEX - (0.005-0.016) mg/m3; formaldehyde -(0,005-0,025) mg/m3;NO2 - (0.003-0.024) mg/m3. To conclude, the main school problems in Kyiv during the heating season are attributed to the absence of proper ventilation system and control over the microclimate in classrooms, which is the primary cause of students' uncomfortable feeling and negative health effects. The defined results will be used in developing recommendations for Ukrainian schools related to the comfort conditions for students and finishing works inside school buildings.
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