The NIOSH Pocket Guide to Chemical Hazards (NPG) celebrates its 40th anniversary in 2018. The guide continues to be the National Institute for Occupational Safety and Health’s (NIOSH) most popular document. It provides descriptive information such as recommendations for exposure limits, protective clothing, and first aid measures for 677 chemicals commonly found in the work environment. Workers, employers, and occupational health professionals use the NPG to control workplace exposures to chemical hazards and as a reference in emergencies. Fire fighters, for example, use the NPG to prepare themselves for chemical exposures they might face during responses to emergency scenarios such as an
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