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The relationship between the degree of exposure and biological effects of manganese was studied in a group of 369 workers employed in the production of ferroalloys. Two other groups of workers, from an electrode plant and from an aluminium rolling mill, served as controls. Mean manganese concentrations at work places where ferroalloys were produced varied(More)
From November 1977 to March 1978, forced expiratory volumes (FEVs) of 78 second graders living in a high sulfur dioxide and smoke pollution area were compared with FEVs of 70 second graders living in a clean air area. The incidence of acute respiratory diseases in these children and their families was also comparatively studied during the same period.(More)
A follow-up study of ventilatory volumes [forced vital capacity (FVC), forced expiratory volume in 1 s (FEV1.0) and maximum expiratory flow at 50% of the FVC (MEF50)] was conducted for selected groups of workers from two plants involving the electrolytic extraction of aluminum (two groups with 95 and 38 workers, respectively), a cement industry (50 workers(More)
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