Ka dibna ka jawaab su'aasha kadib isla luqadda sida marinka: Marinka: Musiibada Hawks Nest Tunnel waxay ka dhacday intii u dhaxeysay 1927 iyo 1932 mashruuc tunnel West Virginia oo uu hogaaminayay Union Carbide. Inta lagu gudajiray dhismaha tunnel, shaqaalaha waxay heleen macdanta silica waxaana laga codsaday inay ka soo saaraan si loogu isticmaalo birta electroprocessing steel. Shaqaalaha looma siin maaskaro ama qalabka neefsashada si ay u isticmaalaan inta ay macdanta ka qodayaan. Sababtoo ah soo-gaadhista boodhka silica, shaqaale badan ayaa ku dhacay silicosis, oo ah cudur sambabada oo daciif ah. Sida laga soo xigtay calaamad goobta ah, waxaa jiray 109 dhimasho ah. Dhageysi la aqbalay oo ka tirsan Congress-ka ayaa tirada dhimashada lagu sheegay 476. Su'aal: Maxaa sababay boodhka silica inuu si xun u saameeyo shaqaalaha miino?
shaqaaluhu ma aysan helin maaskaro ama qalabka neefsashada