Abstract
Abstract Metallic pollutants are of major concern in present pollution studies. The high level of lead concentrations in automotive emissions has attracted the attention of the federal government and to the manufacture of internal combustion engines. Our cities suffer from rising levels of lead in their atmosphere. Ambient air in Los Angeles contains three micrograms of lead per cubic meter. In heavy traffic concentrations have been reported ranging from 14 to 44 micrograms per cubic meter. Concentrations of 1 to 3 μg/m3 have been reported in the outlying and commercial districts respectively, in Cincinnati and Philadelphia (1). Paris has reported 3.3 to 9.8 μg/m3 on her streets (2). Osaka, Japan reported 4.5 μg/m3 in residential levels, 9.9 μg/m3 in factory districts, 10.0 μg/m3 in main traffic arteries and 36.0 μg/m3 in dense traffic (3).
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