Investigation of air pollutants in rural nursery school - A case study

Children's exposure to air pollutants is an important public health challenge. Indoor air quality (IAQ) in nursery school is believed to be different from elementary school. Moreover, younger children are more vulnerable to air pollution than higher grade children because they spend more time indoors, and their immune systems and bodies are less mature. The purpose of this study was to evaluate the indoor air quality (IAQ) at naturally ventilated rural nursery schools located in Upper Silesia, Poland. We investigated the concentrations of volatile organic compounds (VOCs), particulate matter (PM), bacterial and fungal bioaerosols, as well as carbon dioxide (CO₂) concentrations in younger and older children's classrooms during the winter and spring seasons. The concentration of the investigated pollutants in indoor environments was higher than those in outdoor air. The results indicate the problem of elevated concentrations of PM_2.5 and PM₁₀ inside the examined classrooms, as well as that of high levels of CO₂ exceeding 1,000 ppm in relation to outdoor air. The characteristics of PM and CO₂ levels were significantly different, both in terms of classroom occupation (younger or older children) and of season (winter or spring).