Metals and metalloids in PM 10 in Nandan County, Guangxi, China, and the health risks posed

Intense mining, smelting, and tailing activities of polymetallic ore deposits have affected the environment in Nandan County, Guangxi, China. Samples of particulates with aerodynamic diameters low or equal 10 μm (PM ) were collected in Nandan County to investigate the concentrations of and health risks posed by 17 metals and metalloids in the PM . The metal and metalloid concentrations were lower than those found in other industrial cities. The mean Cr concentration was 7.48 ng/m . Significant higher metal and metalloid concentrations were found in PM from mining areas (Dachang and Chehe) than from the control area (Liuzhai) (p 1). The carcinogenic risks posed by Cd, Ni, and Pb were negligible at all sites, while As, Co, and Cr posed potential carcinogenic risks to the residents.