Concentration and Size Distribution of Bacterial and Fungal Bioaerosols and the Related Exposure Dose | ||||
| Egyptian Journal of Physics | ||||
| Article 4, Volume 48, Issue 1, 2020, Page 27-36 PDF (1021.04 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejphysics.2019.14637.1022 | ||||
 View on SCiNiTO | ||||
| Author | ||||
Mona Moustafa 
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| Physics department, Faculty of Science, Minia university, Egypt | ||||
| Abstract | ||||
| In this study, concentration and size distribution of bioaerosols (bacteria and fungi) were obtained in indoor at minimum ventilation and during the operation of air condition system (ACS). Indoo/Outdoor concentration ratio (I/O) of bacteria and fungi were also determined. In addition, the indoor exposure dose (IED) of bacteria and fungi were calculated. A six-stage Andersen cascade impactor was used for sampling the microorganisms during summer season at Minia University, El-Minia (Egypt). Mean bacterial and fungal concentrations were higher (727±160 and 252±60 CFU/m3, respectively ) at minimum ventilation than the concentrations during ACS (506±120 and 176±44 CFU/m3, respectively ). Indoor bacterial concentration level is three times higher than the fungal level. On the other hand, outdoor bacterial concentration (220±55 CFU/m3) is lower than the outdoor fungal level (300±77 CFU/m3). I/O concentration ratio of bacteria was greater than unity indicating that the main source of bacteria is the human occupancy while the corresponding I/O concentration ratio of fungi was less than unity indicating that the fungi are released from outdoor sources. Mean IED of bacteria (38.5 CFU/kg) was about three times higher than the IED of fungi (13.4 CFU/kg) . | ||||
| Keywords | ||||
| Human lung; bioaerosols; concentration; exposure dose; Six-stage Andersen impactor | ||||
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