• Title/Summary/Keyword: Respiratory dust

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Properties of Fine Dust Adsorption Matrix According to the Powdered Activated Carbon Mixing Method based on Blast Furnace Slag (고로슬래그 기반 분말활성탄 혼입방법에 따른 미세먼지 흡착형 경화체의 특성)

  • Kim, Yeon-Ho;Jo, Eun-Seok;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2020.06a
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    • pp.68-69
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    • 2020
  • Recently, the problem of air pollution is drawing attention as a social problem worldwide. Particularly, fine dust is the biggest issue among air pollutants, and it is analyzed that fine dust is generated from air pollutants such as burning fossil fuels such as petroleum or coal, or exhaust gases from automobiles. In addition, yellow dust originating from China adjacent to Korea flows into the Korean Peninsula in a western wind, causing the concentration of fine dust to deteriorate. Fine dust is a harmful substance to the human body such as asthma or respiratory disease, and awareness of the risk is also increasing to a degree designated as a primary carcinogen. In this study, as a method for improving the indoor air quality, the Properties of the matrix according to the mixing ratio of powdered activated carbon based on blast furnace slag are reviewed. The flexural strength and compressive strength were measured, and a fine dust concentration measurement experiment will be conducted later.

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Preventive Effect of Garlic Administration on Respiratory Toxicity Induced through Intratracheal Instillation of Fine Dust (PM10) in Rats (실험동물 랫드를 이용한 미세먼지 기도노출에 따른 호흡기계 독성에 대한 마늘의 예방효과 탐색)

  • Lee, YoonBum;Kim, GeunWoo;Song, YoungMin;Han, YoungHoon;Ha, ChangSu;Lee, JiSun;Kim, MinHee;Son, HyeYoung;Lee, GiYong;Heo, Yong;Kim, ChangYul
    • Journal of Environmental Health Sciences
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    • v.46 no.6
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    • pp.667-675
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    • 2020
  • Objectives: Exposure to fine dust (PM10) could contribute to the occurrence of cardiovascular disease or respiratory abnormalities. Since garlic is known to possess an anti-oxidative stress effect, the present study was performed to evaluate the effect of garlic intake on fine dust-mediated pulmonary toxicity. Methods: Rats were intratracheally instilled with fine dust at 15 mg/kg body weight (BW)/day for five days following five-day intragastric intubation of garlic at 0.7 or 1.4 g/kgBW/day, or 13.1 mg/kgBW/day S-allyl-cysteine (SAC) as a reference component in garlic. Blood and bronchoalveolar lavage fluid (BALF) were collected. Results: Deposit of fine dust was visually and histopathologically observed in the lungs. Body weight gain during the instillation period was significantly lowered in all the groups instilled with fine dust. Neutrophil numbers in blood were significantly elevated in the fine dust alone group, but this alteration was diminished in the groups administered with garlic. Levels of serum glutathione were lower in the rats instilled with fine dust alone, and this decrease in the glutathione level seems dose-dependently compensated among the groups administered with garlic. Similar findings were observed in the BALF with statistical significance. Typical pulmonary histopathological observation related with inflammation was demonstrated in the lungs of the rats exposed to fine dust alone, whereas such histopathologic findings were not improved in the groups administered with garlic. Conclusion: The present study suggests that garlic intake could alleviate fine dust-mediated pulmonary or systemic toxicities. Further investigation is necessary to delineate the mechanism of garlic-mediated effects on pulmonary function.

Development and Evaluation of a Dust Generator Using Soil Samples (토양 분진발생장치의 개발과 평가)

  • Lee, Ji-Yeon;Lee, Ki-Young
    • Journal of Environmental Health Sciences
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    • v.36 no.5
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    • pp.383-390
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    • 2010
  • Exposure to fugitive dust can contribute to several respiratory health problems, and proper sampling of fugitive dust is necessary to assess exposure. However, field sampling of soil dust encounters problems from spatial and temporal differences in soil properties, field operations, and meteorological conditions. To minimize these problems, we designed a dust generator that simulates dust generation from soil. The dust generator consisted of a rotating chamber where soil samples were loaded and tumbled, and a settling chamber, where airborne soil dust samples were collected. As standard operating conditions, we decided on 2 g soil mass, 10 min sampling time, and 20 rpm rotating speed, with a flow rate of 30 l/min, based on three common soil textures of loam, sandy loam and silt loam. To evaluate optimal operating conditions, we used mixtures of Joomoonjin silica sand and clay. Although the average $PM_{10}$ concentration of Joomoonjin silica sand was low, dust concentrations were increased by an increased content of clay. The dust concentrations were consistent across repeated experiments, and showed similar concentration profiles during the sampling time with mixtures of clay and sand (coefficient of variation was $13.6{\pm}w;7.1%$). The results demonstrated that these standard operating conditions were suitable for the dust generator, which can be used to investigate variations in soil properties that affect dust production and potential potency of fugitive dust exposure.

Effects of Ambient Particulate Matter($PM_{10}$) on Peak Expiratory Flow and Respiratory Symptoms in Subjects with Bronchial Asthma During Yellow Sand Period (황사기간 중 천식 환자에서 대기 중 미세먼지($PM_{10}$)가 최대호기 유속과 호흡기 증상에 미치는 영향)

  • Park, Jeong Woong;Lim, Young Hee;Kyung, Ssun Young;An, Chang Hyeok;Lee, Sang Pyo;Jeong, Seong Hwan;Ju, Young-Su
    • Tuberculosis and Respiratory Diseases
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    • v.55 no.6
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    • pp.570-578
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    • 2003
  • Background : Ambient particles during Asian dust events are usually sized less than $10{\mu}m$, known to be associated with the adverse effects on the general populations. But, there has been no considerable evidence linking these particles to the adverse effects on airways. The objectives of this study was to investigate the possible adverse effects of Asian dust events on respiratory function and symptoms in subjects with bronchial asthma. Patients and Methods : From march to June 2002, Asthmatic patients who were diagnosed with bronchial challenge test or bronchodilator response were enrolled. We divided them into three groups; mild, moderate, and severe, according to the severity. Subjects with other organ insufficiency such as heart, kidney, liver, and malignancy were excluded. All patients completed twice daily diaries and recorded peak flow rate, respiratory symptom, and daily activity. Daily and hourly mean pollutant levels of particulate matter < $10{\mu}m$ in diameter($PM_{10}$), nitrogen dioxide($NO_2$), sulphur dioxide($SO_2$), ozone($O_3$) and carbon monoxide(CO) were measured at the 10 different monitoring sites. Results : Dust events occured 14 times during the study period. Daily averages of 4 air pollutant were measured with an increased level of $PM_{10}$, decreased level of $NO_2$ and $SO_2$, and no change in CO during dust days compared to those during control days. An increase in $PM_{10}$ concentration was associated with an increase of subjects with PEF variability of >20% (p<0.05), night time symptom(p<0.05), and a decrease in mean PEF (p<0.05), which were calculated by the longitudinal data analysis. Otherwise, there was no association between $PM_{10}$ level and bronchodialtor inhaler, and daytime respiratory symptoms. Conclusion : This study shows evidence that ambient air pollution, especially $PM_{10}$, during Asian dust events, could be one of the many aggravating factors at least in patients with airway diseases. This data can be used as a primary source to set up a new policy on air environmental control and to evaluate the safety of air pollution index. We also expect that this research will help identify precise components of dust, which are more linked to the adverse effects.

Dust Concentration Monitoring in Korean Native Cattle Farm according to Sampling Location and TMR Process (한우사 내부 위치 및 TMR 배합 작업에 따른 분진 모니터링)

  • Park, Gwanyong;Kwon, Kyeong-Seok;Lee, In-bok;Yeo, Uk-Hyeon;Lee, Sang-Yeon;Kim, Jun-Gyu
    • Journal of The Korean Society of Agricultural Engineers
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    • v.59 no.4
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    • pp.75-83
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    • 2017
  • Many parts of problems in livestock industry today are associated with organic dust. Endotoxin and toxic gasses on the surface of dust and dust itself can cause aesthetic displeasure and respiratory disease. It also reduces livestock productivity by suppressing immunity of animals and carrying microbes causing animal disease. However, dust level of cattle farm was rarely reported in Korea, and regulation for cattle farm worker does not exist. In this paper, dust concentration and environmental condition were regularly monitored in a commercial Korean native cattle farm. The measurement was conducted according to location and working activities. From the measurement, distribution of dust concentration was affected by wind environment, as the result of natural ventilation. TMR mixer was a major source of dust in target cattle house. The maximum inhalable dust concentration was 637.8 times higher than exposure limit as feed dropped into the TMR mixer. It was expected that dust generation could be affected by particle size and drop height of feed. This study suggests potential risk of dust in cattle farm, and necessity for latter study. Effect of aerodynamic condition and TMR processing should be investigated for dust reduction study.

Prevalence of allergic and respiratory conditions among residents living near large construction sites in Sejong city: an exploratory study with mixed method approach (세종시 건설현장 인근 주민의 알레르기 및 호흡기 질환 유병 실태: 혼합연구방법론을 적용한 탐색적 연구)

  • Ki, Myung;Shin, Ji-Yeon;Kim, Lahee;Cho, Seong-Sik;An, Ah Reum;Kim, Yeong-Ju
    • Journal of agricultural medicine and community health
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    • v.40 no.2
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    • pp.80-92
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    • 2015
  • Objectives: To clarify the association between dust from large construction sites and allergic and respiratory conditions among residents in Sejong city. Methods: We included 379 individuals older than 50 years from three areas of Sejong city; two areas near construction sites and one area for a comparison. Prevalence of self-reported allergic and respiratory conditions was compared across the three areas using logistic regression to adjust for covariates including age, gender, smoking, and educational attainment. A total of 16 individuals were interviewed to take details of the residents' experiences of construction work. Results: Those living in the nearby areas around construction sites were generally found to have the increased prevalence for all allergic and respiratory conditions. Odds Ratio(OR)s for cough and sneezing among the six symptoms and allergic rhinitis among the three diagnosed diseases reached statistical significance but only OR for cough remained significant after adjustment: adjusted OR for cough was 2.63 (95% CI, 1.07-6.46). Two relevant themes emerged from semi-structured interview were; 1) most residents from the affected area reported a considerable level of exposure to construction dust, 2) about half of them noted that construction dust influences allergic- and respiratory health. Conclusions: General pattern provides suggestive evidence that living close to construction sites may be positively associated with elevated risks of allergic and respiratory conditions. Efforts should be made to establish preventive measures and a comprehensive in-depth health impact assessment on this issue.

Exposure to Dust and Organic Gas during Chicken Entrance and Shipment Tasks in Poultry Farms (양계장에서 입식 및 출하작업시 분진과 가스상 물질의 노출 측정 조사)

  • Kim, Kyung-Ran;Kim, Hyocher;Lee, Kyungsuk;Chae, Hye-Seon
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.24 no.4
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    • pp.471-477
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    • 2014
  • Objectives: This study was conducted to evaluate area exposure of airborne dust and organic gas during entrance and shipment of chicken in poultry farms Methods: Total dust was measured with NIOSH method 0500. The volume of distributed dust and organic gas(Ammonia, TVOC, Hydrogen Sulfide) were measured using direct reading instrument. Results: The range of concentrations of total dust in area sample was $0.07{\sim}4.91mg/m^3$ during the entrance of chicks and $4.37{\sim}9.4mg/m^3$ during shipment respectively. Concentration of ammonia reached approximately 9 ppm during shipment. There was a difference of concentration of total dust in the area sample between shipment and entrance tasks. Conclusions: It was found that the development of a special intervention program by type of task should be considered for reducing respiratory health effects among poultry farmers.

Strength Properties of Fine Dust Adsorption Matrix using Photocatalyst TiO2 Rutile Replacement Ratio (광촉매 TiO2 루타일 타입 치환율에 따른 미세먼지 흡착형 경화체의 강도 특성)

  • Kyoung, In-Soo;Lee, Won-Gyu;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2019.11a
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    • pp.174-175
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    • 2019
  • Recently, due to air pollution caused by fine dust, it is considered as a social problem. Increasing fine dust has intensified air pollution, causing many diseases and damages. This year, Seoul, South Korea, reached a severe level of fine dust pollution worldwide. The Ministry of Environment has strengthened the environmental standard for fine dust (PM2.5) from $50{\mu}g/m^3$ to $35{\mu}g/m^3$ since March 2018. When fine dust enters the human body, it causes bronchial or skin elongation such as respiratory allergies, irritable pneumonia, asthma and atopy. In this study, $TiO_2$ rutile with photocatalytic activity was used, and materials prepared by rutile sulfuric acid method were used. The photocatalytic activity rate is 95% or more and the density is $4.1g/cm^3$. The matrix was based on cement, and the substitution rate of $TiO_2$ was 0, 5, 10, 15, 20 (%). The test item is flexural strength and compressive strength.

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Effects of Allergen-related Asthmatic Airway Inflammation and Airway Hyperresponsiveness by Asian Sand Dust in Mice (생쥐에서 황사로 인한 항원관련 천식성 기도 염증과 기도 과민성에 미치는 영향)

  • Lim, Heung-Bin;Kim, Seung-Hyung
    • Environmental Analysis Health and Toxicology
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    • v.25 no.2
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    • pp.121-129
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    • 2010
  • This study was carried out to investigate whether asian yellow sand dust (AS) has promoting effects of allergen-related airway inflammation and airway hyperresponsiveness, because the number of patient with allergic asthma and atopy, and with chronic bronchial inflammation and pneumonia have increased steadily in the cities of Korea. The appearance of AS collected was all round and flat, and the diameter was mostly below about 5 ${\mu}m$. When mice were treated with AS suspension by intratracheal instillation combined with ovalalbumin(OVA) sensitization chronically, the level of serum L-lactate dehydrogenase (LDH), IgE and histamine, and respiratory resistance was increased. Intratracheal instillation of AS and OVA also enhanced infiltration of eosinophils in the bronchoalveolar lavage fluid (BALF), IgE and eotaxin expression, and T helper type 2 cell derived cytokines of interleukin (IL)-4, IL-13 and IL-5 as major contributors to allergy and asthma. These results indicate that AS elevates allergen-related airway inflammation and airway hyperresponsiveness in mice and may play an important role in the aggravation of respiratory diseases in Korea.

Relationship between Endotoxin Level of in Swine Farm Dust and Cellular Immunity of Husbandry Workers (돈사 분진 함유 내독소 수준과 축사 작업자들의 세포면역력간 상관성 분석)

  • Kim, Hyoung Ah;Kim, Ji Youn;Shin, Kyeong Min;Jo, Ji Hoon;Roque, Katharine;Jo, Gwang Ho;Heo, Yong
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.23 no.4
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    • pp.393-401
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    • 2013
  • Objectives: Endotoxins in dust generated in occupational settings is known to contribute to the occurrence of respiratory illness among workers. The relationship between the level of endotoxins in total dust or respirable particulates collected from swine farms and immunological markers related with respiratory allergy was evaluated among swine husbandry workers. Materials and Methods: Peripheral blood samples were collected from ten workers at ten swine farms at Gyeonggi province, Korea. Peripheral mononuclear cells were stimulated with phorbol 12-myristate 13-acetate and ionomycin for 48 hours. The levels of various cytokines produced at culture supernatants were determined using a commercially available ELISA kit. The concentration of particulate matter($PM_{10}$) in the indoor air of the swine farms was evaluated using a PVC membrane filter and mini volume air sampler, and endotoxin levels in the dust were measured by Limulus Amebocyte Lysate Kinetic QCL method. Results: Levels of endotoxins in the total dust were categorized into high(geometric mean: $109.35EU/m^3$) and low concentrations (geometric mean: $0.95EU/m^3$) for five swine farms. Interleukin-4 levels were higher in the high endotoxin group than in the low endotoxin group, while interferon-${\gamma}$ levels were lower in the high endotoxin group than in the low endotoxin group. The ratio (interferon-${\gamma}$ to interleukin-4), indicating immunologic skewedness against allergic reactivities, was lower in the high endotoxin group($1.15{\pm}0.60$) than the low endotoxin group($3.09{\pm}2.38$). In addition, the level of interleukin-13, another cytokine contributing to the occurrence of allergic responses, was significantly higher in the at the high endotoxin group($1.12{\pm}0.37ng/m{\ell}$) than in the low endotoxin group($0.37{\pm}0.04ng/m{\ell}$). Hematologic assessment showed significantly lower cellularity in the number of total leukocytes, neutrophils, and eosinophils in the high endotoxin group than in the low endotoxin group. Conclusions: Even though a sufficient number of swine workers and farms were not investigated, this study generlly suggests that the immunological function of swine farm workers exposed to high levels of endotoxin could be modulated toward allergic reactivities.