ATMOSPHERIC DEPOSITION OF POLYCHLORINATED DIBENZO-P-DIOXINS DIBENZOFURANS (PCDD/FS) AND POLYCYCLIC AROMATIC-HYDROCARBONS (PAHS) IN 2 UK CITIES/

As part of the Toxic Organic Micropollutants Survey (TOMPS) bulk (wet and dry) deposition fluxes of PAHs and PCDD/Fs for 1991/92 are present ed for the UK cities of Manchester and Cardiff. The median annual flux for Sigma PAH was 5.2 and 4.1 mu g/m(2)/day for Manchester and Cardif f respectively, with an annual Sigma PCDD/F flux of 1.4 and 1.0 ng/m(2 )/d. These fluxes were comparable with deposition fluxes reported from other studies and add to the growing international database on deposi tion measurements. Fluxes were highly variable at both urban sites, wi th PAH and PCDD/F ranging over an order of magnitude within one season . Seasonality was most apparent for the PCDD/Fs, which showed higher f luxes during the winter months. Simple air to surface transfer velocit ies (cm/s) were calculated using air concentrations from the same samp ling programme. (C) 1997 Elsevier Science Ltd.