According to the Huffington Post, "the proportion of coal miners who suffer from an advanced form of black lung disease has skyrocketed in central Appalachia in recent years, according to experts with the National Institute for Occupational Safety and Health." Health officials says the nearly 10-fold increase is likely due to "workers' overexposure to coal dust, with many miners now working longer hours, or an 'increased toxicity' in dust composition -- that is, even unhealthier air in today's mines," Huffington Post further repors.