Effects of Chronic Occupational Exposure to Measured Concentrations of Benzene

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Abstract
Ten Dow Chemical Company employees exposed to benzene for many years are studied. The levels of exposure to benzene were documented by industrial hygiene surveys. Although some of the exposures to benzene for these 10 employees were high when compared to present standards, and alterations of Hb levels and mean corpuscular volumes were observed during a time of high exposure, monitoring of their health status has shown no persisting, significant adverse health effects. A mortality study, for the years 1940 to 1973, of 594 employees chronically exposed to benzene at the Midland, Mich., Dow location has recently been accepted for publication. This study was followed by a morbidity study of 282 employees, which were a subset of the employees in the mortality study. The morbidity study was based on health data obtained between 1967 and 1974. The ten employees described in this article were included in both the mortality study population of 594 employees and the morbidity study of the 282 employees.

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