Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/21788
Title: Respiratory health of bus drivers in Hong Kong
Authors: Jones, AYM
Lam, PKW
Dean, E
Keywords: Air-conditioned buses
PM10
Respiratory health
Ventilation
Issue Date: 2006
Publisher: Springer
Source: International archives of occupational and environmental health, 2006, v. 79, no. 5, p. 414-418 How to cite?
Journal: International Archives of Occupational and Environmental Health 
Abstract: Objective: We conducted a cross-sectional study to evaluate the lung function and respiratory symptoms of Hong Kong bus and tram drivers exposed to air pollutants. Methods: Demographic information, vital signs, pulmonary function, respiratory symptoms and blood lead levels in 358 male drivers of air-conditioned buses (ACB) were compared with 129 male drivers of non-air-conditioned buses and trams (NACB). Particulate matter (PM10), carbon dioxide (CO2) and carbon monoxide (CO) levels were measured in 16 air-conditioned and 15 non-air-conditioned trams along the same route. Results: Forced vital capacity, forced expiratory volume in 1 s and maximal voluntary ventilation were lower but blood lead levels were higher in the NACB drivers compared with ACB drivers. More NACB drivers compared to ACB drivers reported frequent productive cough, dry cough, as well as sore throat. The measured lung function parameters in the NACB drivers were lower than a cohort of personnel working in an academic environment. The work-year duration was longer and scheduled days off per month were shorter for NACB (13.4 ± 8.8 years and 4.3 ± 1.3 days) compared to ACB drivers (11.5 ± 9 years and 5.4 ± 0.8 days), respectively (P<0.001). The PM10 and CO2 levels were higher in ACB (265 ± 83 μg/m3 and 2,114 ± 69.6 ppm) compared to non-air-conditioned trams (161 ± 103 μg/m3 and 500 ppm, respectively) (P<0.005). Conclusion: We hypothesise that prolonged exposure to air pollutants adversely affects lung function in our NACB drivers but air recirculation could result in higher blood lead levels in ACB drivers.
URI: http://hdl.handle.net/10397/21788
ISSN: 0340-0131
DOI: 10.1007/s00420-005-0061-8
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