ahlam1399
03-24-2016, 01:11 PM
Long k**wn as a workplace hazard, silica dust can cause irreversible lung scarring and cancer. The Department of Labor expects its new limit to save about 600 lives a year. But industry is balking.
أكثر... (http://www.npr.org/sections/health-shots/2016/03/24/471585412/tighter-controversial-silica-rules-aimed-at-saving-workers-lungs?utm_medium=RSS&utm_campaign=news)
أكثر... (http://www.npr.org/sections/health-shots/2016/03/24/471585412/tighter-controversial-silica-rules-aimed-at-saving-workers-lungs?utm_medium=RSS&utm_campaign=news)