To reduce the influences of soil heavy metal pollution on the quality and safety of tobacco leaves,the contents and accumulation conditions of five heavy metals(arsenic, lead, cadmium, chromium and copper)were analyzed. On the basis of environmental quality standard for Grade Ⅱ soil as described in GB 15618—1995, a single-factor pollution index, Nemerow comprehensive pollution index and potential ecological risk index were used to assess soil environmental quality in Hezhou. The results showed that the cont...