Controlling silica dust

Tighter, Controversial Silica Rules Aimed At Saving Workers’ Lungs
March 24, 2016

About 2.3 million people in the U. S. are exposed to fine grains of silica on the job; inhaling the dust is one of the oldest known workplace hazards. Silica, which is basically sand, scars the lungs, causing diseases like silicosis and cancer.