The non-carcinogenic risks to children mainly resulted from Cr,
Mn, Pb, As and Sb, the levels of which were 3 to 10 times higher than the acceptable levels (1.0 × 10−6). The
carcinogenic risks to children were 30 to 200 times higher than the safe level (1.0 × 10−6–1.0 × 10−4), which
could be attributed to Cr, As and Ni pollution.