The indoor air of elementary school classrooms was found to have 5.5 fold higher concentrations of particulate matter (PM) than the outdoor air. Indoor PM contained more silicates, organic, and Ca-carbonate particles and a higher content of endotoxin and cat allergen (Fel d 1). Outdoor PM contained more Ca-sulfate particles and a higher amount of polycyclic aromatic hydrocarbons (PAH). Indoor PM caused cytotoxic effects in keratinocytes, CYP2B6 and CYP3A4 mediated toxicity in a cytochrome P450 cDNA-directed expression system, activation of basophil granulocytes by cat allergen Fel d 1, and a stronger LPS-mediated expression of inflammatory genes. Outdoor PM only induced the expression of xenobiotic metabolizing genes, explained by PAH induction of these genes. Thus, a reduction of classroom PM by ventilation would be reasonable.
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The indoor air of elementary school classrooms was found to have 5.5 fold higher concentrations of particulate matter (PM) than the outdoor air. Indoor PM contained more silicates, organic, and Ca-carbonate particles and a higher content of endotoxin and cat allergen (Fel d 1). Outdoor PM contained more Ca-sulfate particles and a higher amount of polycyclic aromatic hydrocarbons (PAH). Indoor PM caused cytotoxic effects in keratinocytes, CYP2B6 and CYP3A4 mediated toxicity in a cytochrome P450 c...
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