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NIOSH Pocket Guide to Chemical Hazards

September 2005


The NIOSH Pocket Guide to Chemical Hazards (NPG) is intended as a source of general industrial hygiene information on several hundred chemicals/classes for workers, employers, and occupational health professionals. The NPG does not contain an analysis of all pertinent data, rather it presents key information and data in abbreviated or tabular form for chemicals or substance groupings (e.g. cyanides, fluorides, manganese compounds) that are found in the work environment. The information found in the NPG should help users recognize and control occupational chemical hazards.


What's Inside

The Pocket Guide includes the following:

  • Chemical names, synonyms, trade names, conversion factors, CAS, RTECS, and DOT numbers
  • NIOSH Recommended Exposure Limits (NIOSH RELs)
  • Occupational Safety and Health Administration (OSHA) Permissible Exposure Limits (PELs)
  • NIOSH Immediate Dangerous to Life and Health values (NIOSH IDLHs) (documentation for those values)
  • A physical description of the agent with chemical and physical properties
  • Measurement methods
  • Personal protection and sanitation recommendations
  • Respirator recommendations
  • Information on health hazards including route, symptoms, first aid and target organ information.

Download NPG

Download a stand-alone HTML version of the NPG compressed as a ZIP file. The ZIP file contains a condensed version of the NPG. All non-Pocket Guide links were removed so that this set of files acts as a "stand-alone" database. These files can be used with a standard web browser or on some mobile devices. (2MB)
(requires WinZip or other unzipping software)
npg-only.exe (2 MB)
(Self-extracting zip file for Windows)
PDF version (6.04 MB)
NIOSH publication number 2005-149
(Requires Adobe Acrobat Reader for viewing and printing)


We encourage and welcome any comments, suggestions, or corrections that you may have regarding the Pocket Guide. You can contact us via e-mail or telephone. Thank you for your comments and suggestions.

E-mail address:
Toll-free telephone: 1-800-356-4674

Ordering Information

To order multiple copies of the Pocket Guide:

Superintendent of Documents
Government Printing Office
Washington, D.C. 20402-9325
GPO stock number 017-033-00500-1; $37.00

National Technical Information Service (NTIS)
5285 Port Royal Road
Springfield, VA 22161
Order Desk Telephone: (703) 605-6000 or 1-800-553-6847
NTIS order number PB2005-108-099; $29.00

To request the CD-ROM version of the Pocket Guide, contact the NIOSH Publications Office.
Email address:
(Order Publication No. 2005-151)


Pocket Guide cover