Asbestos stands out in that list as causing a significant mesothelioma risk. It's because some of the fibers are so small. There's some speculation that carbon

Asbestos stands out in that list as causing a significant mesothelioma risk. It's because some of the fibers are so small. There's some speculation that carbon fiber will be similarly dangerous, but rock wool and fiberglass aren't quite there. They're nasty but not that nasty.