This report contained revised occupational safety and health guidelines for acetaldehyde (75070), acetic-acid (64197), acetic-anhydride (108247), acetonitrile (75058), acetylene-tetrabromide (79276), acrolein (107028), acrylamide (79061), allyl-alcohol (107186), allyl-chloride (107051), 2-aminopyridine (504290), ammonia (7664417), ammonium-sulfate (7773060), n-amyl-acetate (628637), sec-amyl-acetate (626380), aniline (62533), anisidine (90040), ANTU (86884), azinphos-methyl (86500), benzoyl-peroxide (94360), boron-oxide (1303862), boron-trifluoride (7637072), bromine (7726956), bromoform (75252), butadiene (106990), 2-butoxyethanol (111762), n-butyl-acetate (123864), sec-butyl-acetate (105464), tert-butyl-acetate (540885), n-butyl-alcohol (71363), sec-butyl-alcohol (78922), tert-butyl-alcohol (75650), butylamine (109739), and p-tert-butyltoluene (98511). New guidelines were presented for acetylsalicylic-acid (50782), acrylic-acid (79107), allyl-propyl-disulfide (2179591), amitrole (61825), ammonium-chloride-fume (12125029), atrazine (1912249), barium-sulfate (7727437), benomyl (17804352), bismuth-telluride doped with selenium-sulfide, bismuth-telluride undoped (1304821), boron-tribromide (10294334), bromacil (314409), bromine-pentafluoride (7789302), n-butane (106978), butyl-acrylate (141322), n-butyl-lactate (138227), and o-sec-butylphenol (89725).