Metals RfD (mg/kg/day) References Aluminum 1.2E-05 [4] Manganese 2.0E-06 [5] Copper 2.2E-05 [7] Zinc 6.5E-05 [9] Magnesium 7.38E-01 [10] Iron 8.25

Table 4: Selected RfD for general populations exposed to metals by inhalation from the aluminum production plant.