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KMID : 0895420000100010160
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Journal of Korean Society of Occupational and Enviromental Hygiene
2000 Volume.10 No. 1 p.160 ~ p.169
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A Study on Estimation on Air Exchange Rate and Source Strength in Indoor Air Using Multiple Measurements of Nitrogen Dioxide
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이기영/Lee, Ki Young
정문호/정문식/양원호/Chung, Moon Ho/Zong, Moon Shik/Yang, Won Ho
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Abstract
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Daily indoor and outdoor nitrogen dioxide (NO₂) concentration for 30 days were measured in 28 houses with questionnaire of housing characteristics in Brisbane, Australia, Using mass balance equation and regression analysis, penetration factors and source strength factors were calculated. The penetration factors of 27 houses except one house were between zero and 1, though penetration factor should be between zero and 1 by means of mass balance equation. Relationship between indoor and outdoor concentrations in each 27 house was calculated casing regression analysis. According to the obtained linear regression equation, the slope means penetration factor and the intercept means source strength factor. Calculated mean and standard deviation of coefficients of determination (R²) in electric and gas range houses were 0.70±0.13 and 0.57±0.21, respectively. The source strength factors were more than zero in 27 houses. Mean and standard deviation of slopes in electric and gas range houses were 0.65±0.18 and 0.56±0.12, respectively. Mean and standard deviation of intercepts in electric and gas range houses were 1.49±1.25 and 5.77±3.55, respectively. Air exchange rate and source strength were calculated from penetration factor and source strength factor, respectively. Geometric mean and standard deviation of calculated air exchange rates in 27 houses were 1.1/hr±l.5. Presence of gas range was the most significant factor contributing to indoor NO₂ level in house characteristics (p=0.003). In gas range houses, source strengths ranged from 4.1 to 33.l㎤/hr·㎥ with a mean 12.7㎤/hr·㎥ and a standard deviation 9.8. The source strengths of gas range houses were significantly different from those of electric range houses by t-test (p$lt;0.001).
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