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KMID : 0895420140240040453
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Journal of Korean Society of Occupational and Enviromental Hygiene
2014 Volume.24 No. 4 p.453 ~ p.461
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Characteristics of Size-segregated Mass Concentrations of Indoor Aerosol Particles in University Buildings
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Suh Jeong-Min
Wang Bin
Jang Seong-Ho
Park Jeong-Ho
Choi Kum-Chan
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Abstract
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Objective: Based on the fact that fine particles are more likely to produce negative influences onthe health of occupants as well as the quality of indoor air compared to coarse particles, it is critical to determine concentrations of aerosol particles with different sizes. Thus, this study focused on the size distribution and concentrations of aerosol particles in university buildings.
Method: Aerosol particles in indoor air were collected from four areas: corridors in buildings(In-CO), lecture rooms(In-RO), laboratories(In-LR), and a cafeteria(In-RE). Samples were also collected from outside for comparison between the concentrations of indoor and outdoor particles. For the collection of the samples, an eight stage non-viable cascade impactor was used.
Result: The average concentration of PM10 in the samples collected from indoor areas was 34.65-91.08 μg/m3,and the average for PM2.5 was 22.65-60.40 μg/m3. The concentrations of the aerosol particles in the corridors, lecture rooms, and laboratories were relatively higher than the concentrations collected from other areas. Furthermore, in terms of mass median aerodynamic diameter(MMAD), the corridors and lecture rooms had higher numbers due to their characteristics, showing 2.36 μm and 2.11 μm, respectively. Laboratories running an electrolysis experiment showed 1.58 μm, and the cafeteria with regular maintenance and ventilation had 1.96 μm.
Conclusion: The results showed that the PM10 concentrations of all samples did not exceed indoor air quality standards. However, the PM2.5 concentration was over the standard and, in particular, the concentration of fine particles collected from the laboratories was relatively higher, which could be an issue for the occupants. Therefore, it is important to improve the quality of the indoor air in university buildings.
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KEYWORD
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cascade impactor, indoor aerosol particle, MMAD, university building
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