Monitoring PCDD/Fs in soil and herbage samples collected near a hazardous waste incinerator:: Health risks for the population living nearby

In 1998, we started a wide environmental surveillance program focused on evaluating the environmental impact of polychlorinated dibenzo-p-dioxins and furans (PCDD/Fs) emitted by a new hazardous waste incinerator (HWI) (Tarragona County, Catalonia, Spain) and assessing the potential health risks for the population living nearby. The HWI began regular operations in 1999. Since then, periodical surveys have been performed. We report here the results concerning PCDD/F levels in 40 soil and 40 herbage samples collected in years 2004 and 2005, respectively, in the vicinity of the HWI. The human health risks derived from exposure to PCDD/Fs were also assessed. PCDD/F concentrations in soils ranged from 0.06 to 12.60 ng I-TEQ/kg, with median and mean values of 0.65 and 1.14 ng I-TEQ/kg, respectively. In herbage, PCDD/F concentrations ranged from 0.03 to 1.57 ng I-TEQ/kg, with median and mean values of 0.31 and 0.40 ng I-TEQ/kg, respectively. A comparison of these results with those from the baseline survey shows that, after six years of regular operation, the HWI did not significantly increase PCDD/F levels in soils and herbage in the surrounding environment. Moreover, PCDD/F emissions from the HWI do not mean additional significant risks for the health of the individuals living in the vicinity of the facility. The results of the current study together with those of recent investigations in municipal waste incinerators indicate that, when adequately controlled for PCDD/F emissions, modern waste incinerators should not portend any special concern for the populations living nearby.