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KMID : 1156220190450060630
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Journal of Environmental Health Sciences
2019 Volume.45 No. 6 p.630 ~ p.637
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Secular Trend in Indoor Dust Levels with a Comparison of Indoor and Exhaust Outlet Dust Levels in Swine Confinement Buildings
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Kim Hyoung-Ah
Kim Chang-Yul
Gautam Ravi
Yang Su-Jeong
Acharya Manju
Jo Ji-Hoon
Maharjan Anju
Shin So-Jung
Song Eun-Seob
Lee Yoon-Bum
Kim Hyo-Cher
Kim Kyung-Ran
Lee Kyung-Suk
Heo Yong
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Abstract
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Objectives: This study was performed to evaluate the secular changes in indoor airborne dust or endotoxin levels in the dust from swine confinement buildings. Indoor levels were compared with the level at the exhaust outlet in order to examine the contribution potential of indoor dust to nearby ambient air dust.
Methods: Comparisons were made on inhalable and respirable dust levels reported in 2002, 2012, and 2017 from 14, 10, and 36 swine fattening confinement buildings in Korea, respectively. This data was produced by the same research group. Levels of endotoxin adsorbed into inhalable or respirable dust were also compared.
Samples of inhalable or respirable dust were collected indoors and at exhaust outlets from 17 swine fattening confinement buildings in 2019, and dust levels were compared between the indoor and the outlet.
Results: The outlet inhalable dust level (0.111 mg/m3 ) was approximately 19% of that from indoors, and the respirable dust level (0.033 mg/m3 ) was approximately 74% of that from indoors. The outlet respirable dust levels were lower than the airborne fine dust levels in the towns where those farms are located. No significant difference was observed in the inhalable dust levels among the years examined, but the respirable dust level in 2017 (0.143 mg/m3 ) was significantly lower than in 2002 (0.328 mg/m3 ). The level of endotoxin in inhalable dust was significantly higher in 2017 (722 EU/m3 ) than in both 2002 (75 EU/m3 ) and 2012 (171 EU/m3 ).
Conclusion: Even though no apparent contribution from swine farm indoor dust to nearby ambient air dust was observed in terms of amount, a certain control strategy to reduce the production of airborne dust and endotoxin from swine farms is merited.
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KEYWORD
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Airborne endotoxin, indoor or exhaust out dust level, inhalable and respirable particulate matter, swine confinement buildings
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