Asbestos related disease in the United States

In the United States workers are still exposed to asbestos, and particularly to chyrsotile, mainly in mines, in manufacturing of asbestos-containing products, and in construction, with the extent of exposure widely varying according to the job; familial exposure must also be taken into account. It is quite difficult to evaluate the entity of previous exposures, which have sometimes occurred 30-40 years ago. The risk furthermore varies according to the intensity of exposure and smoking habits. As far as allowed exposure levels are concerned, there is not homogeneity among the laws of different countries; above all it is no longer justifiable to regulate chrysotile differently than the amphiboles.