Although there is the potential for tollbooth workers at the Baltimore Harbor Tunnel to be exposed to high levels of cancer-causing air toxins emitted from the thousands of vehicles that pass under their nose, researchers from the Johns Hopkins Bloomberg School of Public Health found that the tollbooth ventilation system was effective in keeping air toxins out of the tollbooth and away from the workers. The researchers measured levels of volatile organic compounds (VOCs) and particle-bound polycyclic aromatic hydrocarbons (PAHs) inside and outside the tollbooth and found relatively high levels outdoors and relatively low levels indoors. The study is published in the May 1, 2005, issue of Environmental Science & Technology.
“Tollbooth facilities represent a potential worst-case scenario for occupational exposure to mobile source-related air pollution, as these employees spend a majority of their shift within an arm’s length of thousands of vehicles emitting a wide range of toxic pollutants. Yet, little has been done to evaluate worker exposure and the protection afforded by the indoor environment,” Amir Sapkota, PhD, lead author of the study and a post-doctoral fellow in the Bloomberg School of Public Health’s Department of Environmental Health Sciences.
In June 2001, the researchers measured the concentration of air toxins at a tollbooth at the Baltimore Harbor Tunnel. They also examined traffic volume in addition to curbside pollutant concentrations and the concentrations inside the tollbooth. They compared air toxin levels during the three shifts worked by tollbooth employees—morning (6 a.m.–2 p.m.), afternoon (2–10 p.m.) and night (10 p.m.–6 a.m.).
Materials provided by Johns Hopkins University Bloomberg School Of Public Health. Note: Content may be edited for style and length.
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