Studying the efficiency of air cleaners at removing various indoor air impurities in classrooms and the relation to pupils’ symptoms by Leppänen Hanna, Viljamaa Annika, Täubel Martin, Pulkkinen Anni-Mari, Pennanen Arto, Yli-Tuomi Tarja, Lanki Timo, Siponen Taina, Salonen Raimo O., Hyvärinen Anne

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