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The aim of the study was to determine the condition of indoor environmental quality in the selected elementary school through quantitative and qualitative determination of physical and chemical factors, and subjective assessment (questionnaires). Differences between indoor air temperatures in both seasons were small (up to 1пїЅC). The recommended value of 1000 ppm for concentrations of CO2 by Von Pettenkofer was exceeded in all monitored classrooms. Limit value for PM10 (50 ?g/m3) was exceeded by 52.4% (winter) an...