Earlier quoted context omitted.
From the link: > "What we found ... was that the natural products we had in the panel of products that we assessed actually caused the biggest inflammatory response," Professor Zosky said. I'm not sure why they are saying it's the engineering. Their own study says that natural stone products are worse than the engineered products! It's probably there's a larger number of cases of silicosis from engineered products de…
Is it not because the manufactured stone requires manufacturing. So a lot more exposure to the raw materials during the manufacturing process?
I think the important distinction is that with natural stone, much more is cut to fit from the factory (which is easier to handle dust) vs cut on site.