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양원호,손부순,임성국,Yang, Won-Ho,Son, Bu-Soon,Yim, Sung-Kuk 한국환경보건학회 2007 한국환경보건학회지 Vol.33 No.4
Indoor air quality is the dominant contributor to total personal exposure because most people spend a majority of their time indoors. The purposes of this study were to evaluate the alternative method for improvement of indoor air quality in house after coating titanium dioxide ($TiO_2$) photocatalyst for interior part of the house using nitrogen dioxide ($NO_2$) multiple measurements. To evaluate the alternative method in indoor environment, daily indoor and outdoor $NO_2$ concentrations of an apartment and a detached house were daily measured for consecutive 21 days in winter and summer, respectively, Another daily 21 measurements were carried out after $TiO_2$ coating on wall paper of interior part in houses. All $NO_2$ concentrations were measured by passive filter badges. Indoor air quality models using mass balance are useful tool to quantify the relationship between indoor air pollution levels, ambient concentrations, and explanatory variables. Using a mass balance model and linear regression analysis, penetration factor (ventilation rate divided by sum of ventilation rate and decay rate) and source strength factor (emission rate divided by sum of ventilation rate and decay rate) were calculated. Subsequently, the decay constants were estimated. In this study. magnitude of improvement of indoor air quality could be evaluated by decay constant.
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공단지역과 시골지역 주택 실내, 실외 및 개인의 이산화질소 노출평가
양원호,임성국,손부선,Yang, Won-Ho,Im, Sung-Guk,Son, Bu-Soon 한국환경보건학회 2008 한국환경보건학회지 Vol.34 No.3
Indoor air quality can be affected by indoor sources, ventilation, decay, and outdoor levels. Various indoor and out-door combustion sources produce nitrogen dioxide ($NO_2$), which is a by-product of high temperature fossil fuel combustion. Especially, the presence of gas ranges and smoking have been identified as major factors contributing to indoor $NO_2$ exposures. In this study, we compared an industrial complex area with a country area by assessing the personal exposure to $NO_2$with measurements of indoor and outdoor $NO_2$ levels in residences and by house characteristics and questionnaire. Personal exposure concentrations were significantly correlated with indoor $NO_2$ concentrations of residences in both the industrial complex area and the country area with correlation coefficients of 0.561 and 0.664, respectively, compared to outdoors. Multiple regression analysis, indicated that indoor $NO_2$ levels in residences were only affected by outdoor levels (p = 0.000) in spite of higher indoor sources such as smoking. Therefore, it is suggested that outdoor air quality as well as indoor air quality should be considered in the reduction of the personal exposure to air pollutants.
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휴대용 가스렌지 연소에 의한 공기오염물질의 발생량 및 실내환경의 필요 환기량
양원호,임성국,김영희 한국환경보건학회 2007 한국환경보건학회지 Vol.33 No.2
A series of source tests were conducted to characterize emissions of nitrogen oxide(NOx, NO, NO2), carbon monoxide(CO), carbon dioxide(CO2) and total VOCs from portable combustion devices in steady-state using well-mixed chamber. Since use of portable gas range is widespread in houses and restaurants in Korea, it is important to characterize the emission of air pollutants and suggest optimum ventilation rate. Ranges of emission rates of air pollutants from portable gas ranges were NO 0.551~0.939 mg/hr, NO2 0.354~1.080 mg/hr, NOx 1.207~1.631 mg/hr, CO 1.389~4.21 mg/ hr, CO2 2426.823~2973.495 mg/hr, and VOCs 0~0.119 mg/h. Mean of personal exposure and indoor environment level of NO2 by combustion of portable gas range were 74.7 ppb and 65.4 ppb, respectively, suggesting persons using portable gas range in houses and restaurants might be highly exposed. Required ventilation rate to control the air pollutants emitted from portable gas range was maximumly 3.131m3/hr on the basis of NO2 indoor air quality standard.
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