A case control study of lung cancer and non-malignant respiratory disease among employees in asphalt roofing manufacturing and asphalt production.

Two case control studies, one for lung cancer and one for non-malignant respiratory disease excluding influenza and pneumonia, of workers engaged in asphalt roofing manufacturing and asphalt production were performed to determine whether there was an increased risk associated with exposure to asphalt fumes or respirable crystalline silica in these industries. Industrial hygiene data for these roofing and asphalt plants do not exist before 1977. Pre-1977 exposure scenarios were constructed to estimate historic exposures for asphalt fumes and respirable crystalline silica.