Abstract
This paper reports results from a prospective design employed to test the hypothesis that exposure to diesel emissions leads to chronic respiratory effects amongst underground coal miners. Changes in respiratory function and development of chronic respiratory symptoms were measured over a 5-year study period in diesel exposed and control miners from Eastern and Western U.S. underground coal mines. Spirometric measures of respiratory function included Forced Expiratory Volume in one second (FEV1). Forced Vital Capacity (FVC), and Forced Expiratory Flow Rate at 50 per cent of FVC (FEF50). Chronic respiratory symptoms, which included persistent cough, persistent phlegm, and breathlessness, were obtained by questionnaire as were smoking status and occupational history. The pattern of evidence does not support the tested hypothesis when comparing the data on diesel vs. non-diesel exposed miners.
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