Last year OSHA issued a new rule to protect workers in industries like brick manufacturing foundries and hydraulicnbspfrackingnbspfrom silica exposure which can cause lung cancer chronic obstructive pulmonary disease and other conditions The new rule tightened up regulations from 1971Accordingnbspto OSHA about 23 million workers face exposure tonbsprespirablenbspcrystalline silica in their workplaces Most employers can limit harmful dust exposure by using equipment that is widely ava