The NIOSH Pocket Guide to Chemical Hazards is intended as a source of general industrial hygiene information for workers, employers, and occupational health professionals. The Pocket Guidepresents key information and data in abbreviated tabular form for 677 chemicals or substance groupings (e.g., manganese compounds, tellurium compounds, inorganic tin compounds, etc.) that are found in the work environment. The industrial hygiene information found in the Pocket Guide should help users recognize and control occupational chemical hazards. The chemicals or substances contained in this revision include all substances for which the National Institute for Occupational Safety and Health (NIOSH) has recommended exposure limits (RELs) and those with permissible exposure limits (PELs) as found in the Occupational Safety and Health Administration (OSHA) General Industry Air Contaminants Standard (29 CFR 1910.1000). The following selected NIOSH databases are also available on this CD-ROM: 1. Immediately Dangerous to Life and Health Concentrations (IDLHs); 2. International Chemical Safety Cards (WHO/IPCS/ILO); 3. NIOSH Manual of Analytical Methods (NMAM); 4. OSHA Sampling & Analytical Methods; 5. Recommendations for Chemical Protective Clothing; 6. Chemicals Cited by ICSC and NPG - MDL RTECS; 7. Specific Medical Tests Published for OSHA-Regulated Substances; 8. Toxicologic Review of Selected Chemicals; and, 9. 2004 Emergency Response Guidebook (U.S. Department of Transportation).