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KMID : 0382420020280020183
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Korean Journal of Environmental Health Society
2002 Volume.28 No. 2 p.183 ~ p.192
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Residence’s Exposure to Nitrogen Dioxide and Indoor Air Characteristics
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Yang Won-Ho
Jeong Mun-Ho
Bae Hyun-Joo
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Abstract
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Indoor air quality is affected by source strength of pollutants, ventilation rate, decay rate, outdoor level and so on. Although technologies exist to measure these factors directly, direct measurements of all factors are impractical in most field studies. The purpose of this study was to develop an alternative methods to estimate these factors by multiple measurements. Daily indoor and outdoor N02 concentrations for 21 days in 20 houses in summer and winter, Seoul. Using a mass balance model and linear regression analysis, penetration factor (ventilation divided by sum of air exchange rate and deposition constant) and source strength factor (emission rate divided by sum of air exchange rate and deposition constant) were calculated. Subsequently, the ventilation and source strength were estimated. During sampling period, geometric mean of natural ventilation was estimated to be 1.I0:t1.53 ACH, assuming a residential N02 decay rate of 0.8 hr^¹ in summer. In winter, natural ventilation was 0.75:t1.3I ACH. And mean sourcestrengths in summer and winter were 14.8ppb/hr and 22.4ppb!hr, respectively. Although the method showed similar finding previous studies, the study did not measure ACH or the source strength of the house directly. As validation of natural ventilations, infiltrations were measured with CO2 tracer gas in 18 houses. Relationship between ventilation and infiltration was statistically correlated (Pearson r=0.63, p=0.02).
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