A three-year study of air pollution episodes in a semi-rural area

Air pollution episodes in rural or semi-rural areas are strongly dependent upon wind directions relative to more or less distant industrial zones. At distances up to 80 km from emission sources acute episodes are observed which display pollutant levels of the same order of magnitude as the mean levels observed in industrial cities. It is shown that sulfur dioxide is an indicator of immissions of pollutant elements such as Br, As, Sb, Se, Cr and Zn.