Objectives. In this course, we will discuss the following:NCDOL Health Hazards Special Emphasis Program (SEP)Lead, asbestos, silica, hexavalent chromium (CrVI) and isocyanatesExposuresHealth effectsAbatement methods. OSH Health Hazards SEP. This presentation focuses on lead, silica, asbestos, isocyanates and hexavalent chromium. These chemicals have substances with serious health effects from overexposures.OSH has increased the number of inspections to focus on industries that use these chemicals and substances..