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Asadgol, Z. , Nadali, A. , Arfaeinia, H. , Gholi, M. , Fateh, R. , Fahiminia, M.. "Evaluation of Negative Air Ions in Bioaerosol Removal: Indoor Concentration of Airborne Bacterial and Fungal in Residential Building in Qom City, Iran". World Academy of Science, Engineering and Technology, Open Science Index 136, International Journal of Environmental and Ecological Engineering, (2018), 12(4), 300 - 311.