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KMID : 0382420010270010020
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Korean Journal of Environmental Health Society
2001 Volume.27 No. 1 p.20 ~ p.26
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Estimation of Exposure to Nitrogen Dioxide in Professional Drivers Using Time Activity Pattern
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Bang Yong-Nam
Son Bu-Soon
Park Jong-An
Jang Bong-Ki
Yang Won-Ho
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Abstract
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Personal nitrogen dioxide (NO₂) exposures for 31 professional drivers were measured using passive sampler and time activity diary in Asan and Chunan area, and were estimated using time-weighted average model. Mean concentrations of driver’s indoor and outdoor were 24.7±10.7 ppb and 23.3±8.3 ppb, respectively with indoor/outdoor of 1.1. Mean personal NO₂exposure was 30.3±9.7 ppb. Personal NO₂exposures were strongly correlated with indoor car NO₂levels (R²=0.80) rather than residential indoor NO₂level (R²=0.55), and outdoor NO₂level (R²=0.50). The driver’s NO₂exposures using LP-gas with 24.4±8.0 ppb were statistically different from those using diesel with 36.3±14.1 ppb (p<0.01). The effect of driver’s smoking for personal NO₂exposure was not found. It was considered that the main NO₂exposure in driver is transportation. Since drivers mostly spent their times in indoor and inside car, time-weighted average model could be used to estimate the personal NO₂exposure using time activity diary. Though we did not measure all microenvironments, the estimated personal NO₂exposures with 26.9±10.2 ppb were statistically correlated with measured personal NO₂exposures with 30.3±9.7 ppb (R²=0.89). The mean and standard deviation of personal NO₂exposure using Monte-Carlo simulation were 26.6±7.2 ppb.
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