Abstract
Fungal and bacterial aerosol particles concentrations are measured in a school classrooms at two different floors using the 6-stage Andersen impactor as a bioaersol sampler. The average bacterial concentration is higher than the average fungal concentration. The concentrations were 957 and 955 cfu/m3 for bacterial particles at first and second floors, respectively while the fungal particles concentrations were 146 and 235 cfu/m3 at first and second floors, respectively. Most of the biological particles were concentrated at the size range of respirable particles (< 5 µm ) that can penetrate into the alveoli and may cause lung diseases. The human activity is a main factor for the production of microbiological particles. Environmental factors play also a role on the fungal growth. Bacterial concentration is almost twice the guide value of WHO while the fungal concentration is underestimation.
Highlights
Biological particles, including all airborne microorganism, are emitted from almost any natural or anthropogenic surfaces
The concentrations of bacterial particles in the first floor are high at the size (1.1 μm) and increased in the size range (3.3 – 7.0 μm)
The concentration of bacterial particles reaches the maximum value in the size range (1.1 – 2.1 μm) and (4.7 – 7.0 μm)
Summary
Biological particles, including all airborne microorganism, are emitted from almost any natural or anthropogenic surfaces. Humans significantly impact the composition and concentration of microbial aerosols in indoor air [1]. Humans spend most of their time indoors where biological particles can impact on public health [4]. Exposure to biological particles containing airborne microorganism and their by-products can result in different lung diseases [5]. From my previous study there is a positive correlation between the deposition of microorganisms in the human lung and some respiratory diseases [9]. The collected biological particles are sized aerodynamically and can be directly related to human lung deposition. The concentration and size distribution of the particles are vital parameters in the deposition lung models. The objective of this study is to investigate the concentration and size distribution of bacteria and fungi in a school classrooms using Andersen impactor.
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