Support WBURSilica Rule Changes Delayed While Workers Face Health RisksPlay07:19Download AudioNell GreenfieldboyceFebruary 07, 2013 ShareA worker makes a cut in the side of a sandstone block at the Cleveland Quarries facility in Vermilion, Ohio, earlier this month. The legal limit on the amount of silica that workers can inhale was set decades ago. (Bloomberg via Getty Images)
