Air Monitoring of Polychlorinated Biphenyls and Organochlorine Pesticides in Eastern Siberia: Levels, Temporal Trends, and Risk Assessment

In this study, we evaluate the long-term and seasonal variations of polychlorinated biphenyls (PCBs), hexachlorobenzene (HCB), α-, γ-hexachlorocyclohexanes (HCH), p,p′-dichlorodiphenyltrichloroethane (p,p′-DDT) its metabolites through a passive air sampling method at two (urban suburban) stations in Eastern Siberia, Russia, 2011–2017. The median levels HCB, ∑HCHs, ∑DDTs, ∑PCB39, ∑PCB6 were 116, 84, 55, 128, 41 pg/m3 83, 21, 11, 52, 16 urban suburban stations, respectively. PCB HCH Irkutsk decreased considerably 2000s, comparison to late 1980s early 1990s, while an increasing trend was observed for HCB during 2010s. seasonality concentrations (with summer higher than winter concentrations) well exhibited by PCB, HCH, DDT, but not HCB. Significant correlations between approximately all studied persistent organic pollutants average temperature, quantity precipitation, frequency prevailing wind direction period. daily doses PCBs, DDTs, HCHs, under human exposure inhalation amounted 38, 27, 35 17, 6, 7, 27 pg/kg body weight per day areas,