| Abstract: | Ambient lead level concentrations have been measured during a three month period at 21 sampling sites in and near Champaign-Urbana, Illinois. Concentrations were determined at downtown, university, residential, suburban, and rural locations. The individual contributions from local sources and background to the Pb concentration in the urban area were determined from measurements and a mathematical model. From a statistical analysis of the data, it is shown that there are no significant differences among the nine residential sites. The group means of residential, university, and downtown stations are significantly different. |
