Abstract
Accumulation of lead in soils over a period of approximately 40 years was compared for areas of high and low motor vehicle traffic densities. Where motor vehicle traffic density was less than 80 motor vehicles per square mile, no lead accumulations were observed, but where the motor vehicle traffic density was greater than 580 motor vehicles per square mile, the concentration of lead in the surface 2.5 cm. of soil increased by a factor of two to three times. Although large percentage increases were observed in the surface soils from the areas of high motor vehicle traffic density, the amount of lead found in the surface soil did not exceed 52 ppm, a level which is common to many soils from areas of low motor vehicle traffic density and not subjected to atmospheric or industrial lead contaminations.
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