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There are many studies focusing on indoor air quality in primary and secondary schools. Nevertheless, studies in nursery schools are still few. Concentrations of indoor air pollutants are typically 2-5 times higher, and occasionally 100 times higher than outdoors. Children spend more time in nursery and preschools than in any other indoor microenvironment besides home. It is generally assumed that preschool students are more susceptible to the adverse effects of poor indoor air quality (IAQ) than elementary or mid...