Labelmaster niosh0003 niosh pocket guide to chemical hazards, spiral bound quickly recognize and control occupational chemical hazards with the niosh pocket guide to chemical hazards. The npg contains chemical names, synonyms, trade names, conversion factors, cas, rtecs, and dot numbers, niosh recommended exposure limits (niosh rels), osha permissible exposure limits (pels), niosh immediate dangerous to life and health values (niosh idlhs), and more, making it an indispensable tool for anyone dealing directly with hazmats.