NIOSH Pocket Guide to Chemical Hazards This handy pocket guide provides detailed regulatory information on more than 350 specific chemicals. A valuable tool for every empolyee coming into contact with hazardous chemicals, it helps emplyees repond to workplace emergencies, prevent overexposure to chemicals and protect their health. Permissible Exposure Limits (PEL), chemical and physical properties, respiratory requirements, PPE and more are in this revides 1998 edition.