Abstract
A joint study of the concentrations of lead in the atmospheres of three cities was conducted during the period June 1961 through May 1962. The annual average concentrations at various locations ranged in Cincinnati from 1 to 2 μg/m3, in Philadelphia from 1 to 3 μg/m3, and in Los Angeles from 2 to 3 μg/m3, with overall averages respectively of 1.4, 1.6, and 2.5 μg/m3. In heavy traffic, concentrations averaged from 14 to 44 μg/m3 in various locations. Blood and urine samples analyzed for lead were within the “normal” limits, except for a few persons with occupational exposures.