Every year, more than 250 workers in the United States die with silicosis, an incurable, progressive lung disease caused by overexposure to dust containing silica. Hundreds more become disabled by this disease. Every one of these cases is an unnecessary tragedy, because silicosis is absolutely preventable. If you work, or you are an employer, in one of the dozens of industries where dust containing silica is present, you need to know how to prevent this disease. This guide . a cooperative effort between the Department of Labor and the National Institute for Occupational Safety and Health in the Department of Health and Human Services . explains how you can protect yourself and others each day on the job.