Atmospheric Wet Deposition of PCDD/Fs in the Ambient Air

Wet deposition is an important mechanism for removing air pollutants from the atmosphere. The total PCDD/Fs-WHO2005-TEQ wet 2018–2020 was investigated Beijing and Tianjin City in this study. In addition, gas-particle partitioning of deposition, concentrations rain, PM2.5-bound content, PM2.5 concentration were also studied City, respectively. Between 2018 to 2020, as a whole, average seasonal variations PCDD/F fluxes spring, summer, fall, winter 50.50, 41.47, 23.03 16.76 pg WHO2005-TEQ m–2 month–1, respectively, while Tianjin, they 35.30, 42.40, 13.37, 14.77 Because two cities have more rainfall spring summer than do fall winter, has significant influence on flux. regard Beijing, rain 1.70, 0.39, 1.42, 1.52 L–1, those 1.73, 0.42, 1.35, 1.88 above results show that are significantly lower which mainly due fact lower, proportion gas phase increased. When washed away by heavy rainfall, diluted.