Size distribution and concentration of indoor culturable bacterial and fungal bioaerosols

Jeong, Sang Bin; Ko, Hyun Sik; Heo, Ki Joon; Shin, Jae Hak; Jung, Jae Hee

doi:10.1016/j.aeaoa.2022.100182

Cited by 8 publications

(9 citation statements)

References 33 publications

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“…Moreover, to evaluate the impact of microbes' sizes for breathing areas, a TCR TECORA Pollution Check IMP-6 Bio (6 stages aerodynamic particle sizing) was used in a 100 m 2 test room at 28. www.nature.com/scientificreports/ from 1.1 to 0.65 μm. Stages reflects the location of depositing of inhalable bacteria in the human lungs, where 1-2 altogether represents bacteria of the upper airway and 3-6 the respirable microbial particles 40,41 . Collection was performed in the so-called human breathing zone, considered at 1.5 m above the floor and 1.0 m from the walls.…”

Section: Indoor Air Spread Microbial Counting In Colony Forming Units...mentioning

confidence: 99%

TiO2–Ag–NP adhesive photocatalytic films able to disinfect living indoor spaces with a straightforward approach

Chirumbolo

Gibellini

Berto

et al. 2023

Sci Rep

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TiO2–Ag doped nanoparticulate (TiO2–Ag–NP) adhesive photocatalytic films were used to assess the ability in dropping down the burden of indoor microbial particles. The application of an easy-to use photocatalytic adhesive film to cleanse indoor living spaces from microbial pollution, represents a novelty in the field of photocatalytic devices. Reduction was attained by photocatalysis in selected spaces, usually with overcrowding (≥ 3 individuals) in the common working daily hours, and upon indoor microclimate monitoring. TiO2–Ag doped nanoparticulate (TiO2–Ag–NP) adhesive photocatalytic films were applied within five types of living spaces, including schools and job places. The microbial pollution was assessed at time 0 (far from routine clean, ≥ 9 h) and throughout 2–4 weeks following the photocatalyst application by relative light unit (RLU) luminometry and microbial indirect assessment (colony forming units per cubic meter, CFU/m3). TiO2–Ag–NP photocatalyst reduced RLU and CFU/m3 by rates higher than 70% leading to RLU ≤ 20 and microbial presence ≤ 35 CFU/m3. The described TiO2–Ag–NP is able to reduce microbial pollution to the lowest RLU threshold (≤ 20) within 60 min in open daylight in a standardized test room of 100 m2. The correlation between RLU and CFU/m3 was positive (r = 0.5545, p < 0.05), assessing that the microbial reduction of indoor areas by the TiO2–Ag–NP adhesive film was real. Titania photocatalysts represent promising tools to ensure air cleaning and sanitization in living indoor microclimates with a low cost, feasible and straightforward approach. This approach represents an easy to handle, cost effective, feasible and efficacious approach to reduce microbial pollution in indoor spaces, by simply attaching a TiO2–Ag–NP adhesive film on the wall.

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Section: Indoor Air Spread Microbial Counting In Colony Forming Units...mentioning

confidence: 99%

TiO2–Ag–NP adhesive photocatalytic films able to disinfect living indoor spaces with a straightforward approach

Chirumbolo

Gibellini

Berto

et al. 2023

Sci Rep

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“…Air quality in the indoor environment can be influenced by biotic agents such as microorganisms, spores, mites, and pollen. With these particle types general termed bioaerosols (Jeong et al, 2022). These…”

Section: Abstract Aspergillus • Books Collection • Cascade Impactors ...mentioning

confidence: 99%

“…1). The impactor was operated at the height of 1.5 m so that particulates would be captured at the respirable level (Grzyb et al, 2022;Jeong et al, 2022), at a flow rate of 28.3 l/min verified by a rotameter attached to the device.…”

Section: Samplingmentioning

confidence: 99%

Assessment of fungal aerosols in a public library with natural ventilation

et al. 2022

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Fungal aerosols deteriorate library collections and can impact human health, mainly via respiratory diseases. Their spread is influenced by factors such as temperature and relative humidity. This study aims to assess the concentration of fungal aerosols in the interior environment of the Popular Library of Gaira in the District of Santa Marta, Colombia, using a two-stage cascade impactor utilizing Sabouraud dextrose agar on Petri dishes for the collection of samples. The sampler was positioned at 1.5 m above ground level, operated with a flow rate of 28.3 l/min for 4 min and thermo-hygrometric conditions were also recorded. Concentrations in the air of up to 1197.0 CFU/m3 were reported, with a mean value close to 150 CFU/m3. Higher values during the morning samples were noted. Seven genera of fungi were found, Aspergillus and Curvularia were the most abundant. The temperature was between 30.80 and 33.51 °C, and the relative humidity was between 62.61 and 64.80%. Statistical analysis showed a significant correlation between the fungal aerosol concentration and relative humidity, where an increase of 10% in moisture could double the fungal aerosol concentration. We concluded that potentially favorable conditions exist indoors for the growth and survival of the following fungi: Aspergillus, Penicillium, Cladosporium, and Curvularia, and to a lesser extent for Chrysonilia, Cunninghamella, and Paecylomices. Relative humidity was seen to be the factor that affects the concentration of aerosols fungal in the library most significantly.

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“…These results are in agreement with previous studies. The authors determined with 6-stage Andersen impactor that average value for fungal aerosol diameters were between 2.1 µm and 4.7 µm [5] or between 1.1 µm and 3.3 µm [25]. The cut-off diameter of bacterial aerosols were less than 2.1 µm [25].…”

Section: Measurements Of Microbial Concentrationmentioning

confidence: 99%

Analysis of Particulate and Microbiological Filtration Performance of Air Handling Unit Filters in a Low-Energy Office Building over 12 Months

et al. 2022

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Indoor air quality is an important consideration for the health and well-being of building occupants, and the SARS CoV-2 pandemic highlighted the importance of maintaining proper ventilation in buildings. Air handling units (AHUs) are used to provide fresh air and maintain occupant comfort. The objective of this work was to study the evolution of filtration efficiency in an AHU fitted with bag filters, installed to treat office air in a low-energy building, over a 12-month period. The particulate filtration efficiency (PFE) and the microbial filtration efficiency (MFE) were quantified by measuring particle size distribution and bacterial and fungal concentration in the air circulating in the AHU. The resulting microbial concentration measurements in the fresh air (between 10²–103 CFU/m3 for fungi and around 103 CFU/m3 for bacteria) were higher than those in the extracted air from the offices (between 101 and 102 CFU/m3 for fungi and around 102 CFU/m3 for bacteria). The PFE and MFE measured were almost constant throughout the 12 months, with an increase of the filter pressure drop from 70 to 90 Pa. The PFE and MFE were quite comparable for a particle diameter. Therefore, the measurement of PFE is a reliable indicator of the MFE.

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Size distribution and concentration of indoor culturable bacterial and fungal bioaerosols

Cited by 8 publications

References 33 publications

TiO2–Ag–NP adhesive photocatalytic films able to disinfect living indoor spaces with a straightforward approach

TiO2–Ag–NP adhesive photocatalytic films able to disinfect living indoor spaces with a straightforward approach

Assessment of fungal aerosols in a public library with natural ventilation

Analysis of Particulate and Microbiological Filtration Performance of Air Handling Unit Filters in a Low-Energy Office Building over 12 Months

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