After dust control measures were put in place the incidence of progressive massive fibrosis declined, but recently it is making a come back in coal mine workers. What do you think is the cause and how to bring the incidence down again ?
Some possible reasons. are:
failure of dust control (coal and silica)
inadequate dust standards
change in diagnostic/clasification criteria
mining coal seams containing more silica
more precise imaging techniques
better reporting
Best way to bring it down is to improve dust control
see attached US reference but there have also been a few new PMF cases in Australia.https://oem.bmj.com/content/73/Suppl_1/A9.2
I believe that the coal mine industry have been moved from the west to the east, to countries where HSE prevention is not a main priority of the companies.
If the question is about the west, I remember to seeing statistics on the increase of silicosis in the ornamental stone industry with the new products of aggregates, and the workers of these kind of companies than work cutting these materials
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