Objective To monitor the concentrations of atmospheric pollutants in duty areas of indoor and outdoor traffic police in Guangzhou, to identify characteristics and levels of exposure, and to provide field data for bio-effect assessments among populations with high exposure to vehicle exhausts.
Methods Concentrations of NO2, CO, PM10 and SO2 in different duty areas were monitored with electronic analyzer and further processed into relevant air quality indices for evaluation and comparison.
Results The average concentrations of NO2, CO, PM10 and SO2 in the duty areas of outdoor traffic police were (0.34& #177; 0.17), (1.93& #177;2.97), (0.10& #177;0.05) and (0.49& #177;1.54) mg/m3, respectively; the level of comprehensive air quality index was Level V, indicating heavily polluted, and the major pollutants were NO2 and SO2. The average concentrations of NO2, CO, PM10 and SO2 in the duty areas of indoor traffic police were (0.08& #177;0.05), (0.22& #177;0.26), (0.05& #177;0.05) and (0.02& #177;0.02) mg/m3, respectively, which were significantly lower than those exposed to the outdoor traffic police; the level of comprehensive air quality index was Level Ⅱ , indicating clean, and NO2 and PM10 were the major pollutants.
Conclusion The concentrations of main ambient pollutants in the duty areas of outdoor traffic police are higher than corresponding standards, among which NO2 is the highest one and identified as medium-serious pollution, indicating the outdoor duty areas are characterized by mixed air pollution. The indoor traffic police are exposed to significantly lower concentrations of air pollutants than the outdoor traffic police.
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