Based on the analysis of sampled fog water in the north suburb of Nanjing city during December 2006,study is conducted of heavy metals of fog water and air pollution in foggy weather.Results show that foggy weather condition prevented the diffusion of pollutants,which led to the heavier air pollution and changes in pollutant concentrations were approximately in step with fog formation/dissipation;the heaviest concentration of PM₁₀ on fog days was 2.5 to 10 times that in the pre-fog stage.The heavy metal concentrations of fog-water ranged from 0.020 5 to 1.824 8 mg/L,with a mean of 1.32 mg/L;one-to-one correlation analysis between concentrations of heavy metals(Cd,Cr,Cu,Mn and Fe except As)and those of gaseous pollutants shows that their correlation coefficients were all greater than 0.91,thereby indicating that heavy metal and gaseous pollutants were emitted by the same pollution source.