PCB contamination from polysulphide sealants in residential areas-exposure and risk assessment

The mean total PCB concentration was 6.83 mg/kg within 2 m of the buildings and 0.52 mg/kg within 3-10 m from of the buildings. The deterministic risk assessment with conservative parameters resulted in lifetime cancer risk estimates on the order of 10−6-10−7. The lifetime average daily dose (LADD) for PCBs was less than 10% of the reference dose (RfD) 0.02 μg/kg day, which is based on immunosupression in monkeys. The LADD corresponding to the total site attributable exposure was less than 10% of the estimated average dietary PCB intake in Finland. Children can, however, in worst cases be exposed to daily doses near the level of the RfD. Low cost measures are recommended to reduce possible exposure of children.