Thermal Environmental Interference with Airborne Bacteria and Fungi Levels in Air-Conditioned Offices

2008 ◽  
Vol 17 (2) ◽  
pp. 122-127 ◽  
Author(s):  
L.T. Wong ◽  
K.W. Mui ◽  
P.S. Hui ◽  
W.Y. Chan ◽  
A.K.Y. Law
Keyword(s):  
Airborne Bacteria ◽  
Bacteria And Fungi ◽  
Environmental Interference

Assessment of the indoor air quality based on airborne bacteria and fungi measurements in a public school of Istanbul

2020 ◽  
Vol 13 (24) ◽  
Author(s):  
Nuket Sivri ◽  
Ahmet Ozgur Dogru ◽  
Arzu Funda Bagcigil ◽  
Kemal Metiner ◽  
Dursun Zafer Seker
Keyword(s):  
Air Quality ◽  
Public School ◽  
Indoor Air Quality ◽  
Indoor Air ◽  
Airborne Bacteria ◽  
Bacteria And Fungi

scholarly journals Airborne Bacteria and Fungi Concentration in Relation with Bedding Type in Broiler Houses

2019 ◽  
Vol 76 (2) ◽  
pp. 222
Author(s):  
Silvana POPESCU ◽  
Cristin BORDA ◽  
Cristina EL MAHDY ◽  
Eva Andrea LAZAR ◽  
Anamaria BLAGA PETREAN ◽  
...  
Keyword(s):  
Sunflower Seed ◽  
Microbial Contamination ◽  
Production Cycle ◽  
Airborne Bacteria ◽  
Airborne Concentration ◽  
Commercial Farms ◽  
Bacteria And Fungi

The aim of this work was the investigation of the effect of bedding type on the airborne concentration of bacteria and fungi in broiler houses. The study was performed in two commercial farms (A and B) with different bedding (chopped straw in farm A, sunflower seed hulls in farm B). The determination of the bacteria and fungi’s numbers was performed in the first and the sixth weeks of the production cycle. Both the concentration of the bacteria and fungi showed higher values in the farm A compared with the farm B, especially in the latter period of the production cycle. In both farms, significant differences (P < 0.05) were recorded between the two periods of the determinations. The results of this study suggest that using sunflower seed hulls as bedding leads to lower levels of microbial contamination of the air in broiler houses, comparing with the use of chopped straw.

scholarly journals A systematic review and meta-analysis of indoor bioaerosols in hospitals: The influence of heating, ventilation, and air conditioning

PLoS ONE ◽  
2021 ◽  
Vol 16 (12) ◽  
pp. e0259996
Author(s):  
Rongchen Dai ◽  
Shan Liu ◽  
Qiushuang Li ◽  
Hanting Wu ◽  
Li Wu ◽  
...  
Keyword(s):  
Air Quality ◽  
Air Conditioning ◽  
High Efficiency ◽  
Practical Implication ◽  
Meta Analysis ◽  
Hvac Systems ◽  
Cochrane Library ◽  
Airborne Bacteria ◽  
Bacteria And Fungi

Objectives To evaluate (1) the relationship between heating, ventilation, and air conditioning (HVAC) systems and bioaerosol concentrations in hospital rooms, and (2) the effectiveness of laminar air flow (LAF) and high efficiency particulate air (HEPA) according to the indoor bioaerosol concentrations. Methods Databases of Embase, PubMed, Cochrane Library, MEDLINE, and Web of Science were searched from 1st January 2000 to 31st December 2020. Two reviewers independently extracted data and assessed the quality of the studies. The samples obtained from different areas of hospitals were grouped and described statistically. Furthermore, the meta-analysis of LAF and HEPA were performed using random-effects models. The methodological quality of the studies included in the meta-analysis was assessed using the checklist recommended by the Agency for Healthcare Research and Quality. Results The mean CFU/m3 of the conventional HVAC rooms and enhanced HVAC rooms was lower than that of rooms without HVAC systems. Furthermore, the use of the HEPA filter reduced bacteria by 113.13 (95% CI: -197.89, -28.38) CFU/m3 and fungi by 6.53 (95% CI: -10.50, -2.55) CFU/m3. Meanwhile, the indoor bacterial concentration of LAF systems decreased by 40.05 (95% CI: -55.52, -24.58) CFU/m3 compared to that of conventional HVAC systems. Conclusions The HVAC systems in hospitals can effectively remove bioaerosols. Further, the use of HEPA filters is an effective option for areas that are under-ventilated and require additional protection. However, other components of the LAF system other than the HEPA filter are not conducive to removing airborne bacteria and fungi. Limitation of study Although our study analysed the overall trend of indoor bioaerosols, the conclusions cannot be extrapolated to rare, hard-to-culture, and highly pathogenic species, as well as species complexes. These species require specific culture conditions or different sampling requirements. Investigating the effects of HVAC systems on these species via conventional culture counting methods is challenging and further analysis that includes combining molecular identification methods is necessary. Strength of the study Our study was the first meta-analysis to evaluate the effect of HVAC systems on indoor bioaerosols through microbial incubation count. Our study demonstrated that HVAC systems could effectively reduce overall bioaerosol concentrations to maintain better indoor air quality. Moreover, our study provided further evidence that other components of the LAF system other than the HEPA filter are not conducive to removing airborne bacteria and fungi. Practical implication Our research showed that HEPA filters are more effective at removing bioaerosols in HVAC systems than the current LAF system. Therefore, instead of opting for the more costly LAF system, a filter with a higher filtration rate would be a better choice for indoor environments that require higher air quality; this is valuable for operating room construction and maintenance budget allocation.

scholarly journals Data on airborne bacteria and fungi emission from a conventional hospital wastewater treatment plant

Data in Brief ◽  
2020 ◽  
Vol 28 ◽  
pp. 105019 ◽  
Author(s):  
Ahmadreza Yazdanbakhsh ◽  
Mona Ghazi ◽  
Fatemeh Sahlabadi ◽  
Fahimeh Teimouri
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Airborne Bacteria ◽  
Hospital Wastewater ◽  
Bacteria And Fungi

scholarly journals The influence of air-dispersed essential oils from lemon (Citrus limon) and silver fir (Abies alba) on airborne bacteria and fungi in hospital rooms

2019 ◽  
Vol 54 (3) ◽  
pp. 256-260 ◽  
Author(s):  
Alicia Lanzerstorfer ◽  
Melanie Hackl ◽  
Matthias Schlömer ◽  
Brigitte Rest ◽  
Evelyn Deutsch-Grasl ◽  
...  
Keyword(s):  
Essential Oils ◽  
Abies Alba ◽  
Airborne Bacteria ◽  
Citrus Limon ◽  
Silver Fir ◽  
Bacteria And Fungi

Exposure level and distribution of airborne bacteria and fungi in an urban utility tunnel: A case study

2020 ◽  
Vol 96 ◽  
pp. 103215
Author(s):  
Ying Zhang ◽  
Dingmeng Wu ◽  
Qiangqiang Kong ◽  
Angui Li ◽  
Yuefei Li ◽  
...  
Keyword(s):  
Airborne Bacteria ◽  
Exposure Level ◽  
Utility Tunnel ◽  
Bacteria And Fungi
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