I read an article this morning "Employers Call to Withdraw Silica Rule". This article updates where the construction industry and the government are with the proposed rule on Occupational Exposure to Respirable Crystalline Silica.
Not to make light of this topic, but it seems like a lot of "dust in the wind". What I mean by that is the article points out that the "measure is significantly flawed" and this writer agrees.
The key issue from this writer's view is the statistics taken by the agency to support their measurements for exposure hazards are over such an exaggerated period of time and for such long hour durations that no one would ever be exposed to Silica to that degree.
Let's say it this way. No one and I mean No one works in an environment where Silica dust is present 10 hours a day for 40 years. That my friend is distorted and obsured, but that is just one writer's opinion. Check out the article for yourself to get more details.