Abstract
Both acute and chronic impairments of lung function have been demonstrated in humans after exposure to diesel exhaust. The concentration of soot particles in the diesel exhaust is significantly related to its effects on health. The aim of the present analysis was to study the relationship between the concentration of respirable dust as an indicator of exposure to soot particles in diesel exhaust and a biologic exposure indicator variable, i.e., transient lung function decrease. Daily time-weighted average concentrations of carbon monoxide and nitrogen dioxide amounted to 9 % and 25% of the applicable hygienic limit values. Time-weighted average concentration and the proportion of respirable dust in total dust during a workshift were significantly correlated with across-shift decreases in lung function. In the absence of a suitable measure for total diesel exhaust exposure, the ratio of the proportion of respirable dust in total dust in a workplace may serve as an indicator of the concentration of soot particles in diesel exhaust.
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