Journal
ENVIRONMENTAL RESEARCH
Volume 94, Issue 3, Pages 291-296Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2003.08.004
Keywords
taxi driver; nitrogen dioxide; passive sampler; exposure; microenvironmental model
Funding
- NIEHS NIH HHS [P30 ES03819] Funding Source: Medline
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Occupational and nonoccupational personal nitrogen dioxide (NO2) exposures were measured using passive samplers for 31 taxi drivers in Asan and Chunan, Korea. Exposures were also estimated using a microenvironmental time-weighted average model based on indoor, outdoor and inside the taxi area measurements. Mean NO2 indoor and outdoor concentrations inside and outside the taxi drivers' houses were 24.7 +/- 10.7 and 23.3 +/- 8.3 ppb, respectively, with a mean indoor to outdoor NO2 ratio of 1.1. Mean personal NO2 exposure of taxi drivers was 30.3 +/- 9.7 ppb. Personal NO2 exposures for drivers were more strongly correlated with interior vehicle NO2 levels (r = 0.89) rather than indoor residential NO2 levels (r = 0.74) or outdoor NO2 levels (r = 0.71). The main source of NO2 exposure for taxi drivers was considered to be occupational driving. Interestingly, the NO2 exposures for drivers' using LPG-fueled vehicles (26.3 +/- 1.3 ppb) were significantly lower than those (38.1 +/- 1.3 ppb) using diesel-fueled vehicle (P < 0.01). Since drivers spent most of their time inside their vehicle and indoors at home, a microenvironmental model was used to estimate the personal NO2 exposure with indoor and outdoor NO2 levels of the residence, and interior vehicle NO2 levels (P < 0.001). Some subpopulations, such as professional drivers, might be exposed to high NO2 levels because they drive diesel-using vehicles outdoors in Korea. (C) 2003 Elsevier Inc. All rights reserved.
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