The Air Transport of Lead Compounds Present in Automobile Exhaust Gases

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Abstract
The movement of particulate lead compounds from the exhausts of gasoline-driven motor vehicles on a heavily travelled high-speed roadway (120,000 vehicles/24 hours) is under investigation in the Cincinnati area. The findings for the first year of the investigation indicate an average concentration of 7.8 micrograms/m3 at the roadway, 1.7 micrograms/m3 1300 feet to the leeward, and 1.1 micrograms/m3 at the station, 11000 feet leeward of the source of the lead. The concentration of lead in the air at the latter station is approximately the same as that of six years ago, as reported in the Public Health Service Publication No. 999-AP-12. The mass median equivalent diameter of the lead particles was found to be approximately 0.30 micron, with 70% of the lead being in the particles below 1 micron in diameter. Diurnal patterns reflected rush hour traffic as well as climatic conditions. Concentrations of lead in soils and grasses varied according to the distance from the roadway, with most of the contamination occurring within 100 feet of the roadway.

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