For evaluating human health risks of 5 elements including Pb, Cr, Cd, As and Ni in PM2.5 in Suzhou Industrial Park, PM2.5 and the above 5 elements in PM2.5 were monitored in January, April, August, November, 2015. The model recommended by “Technical guidelines for risk assessment of contaminated sites”(HJ 25.3—2014) was used to evaluate the health risks caused by breathing. The results showed the mass concentration of Pb, Cr, Cd, As, Ni in PM2.5 were 76.2 ng/m3、6.92 ng/m3、1.45 ng/m3、4.14 ng/m3 and 5.71 ng/m3 respectively, which showed a descending order of Pb>Cr>Ni>Cd>As. The carcinogenic risk and hazard quotient of these 5 elements were between 6.89×10-15~6.84×10-12 and 2.57×10-9~4.80×10-7, respectively, both were under the acceptable risk level. Overall, the pollution of heavy metals in Suzhou Industrial Park was relatively slight. |