The current intelligence bulletins (CIBs) produced by NIOSH as of July 1985 were summarized. In the CIBs, NIOSH reported new scientific information concerning known and emerging occupational hazards. Data obtained from the National Occupational Hazard Survey conducted between 1972 and 1974 were used to estimate the working population exposed to the substances investigated. Any NIOSH policy changes made after the CIBs were issued were included in the summaries. During the years 1975 through 1985, NIOSH published 44 CIBs which dealt with the health hazards of occupational exposure to the following chemicals and agents: chloroprene (126998), trichloroethylene (79016), ethylene-dibromide (106934), chrome pigment, asbestos (1332214), hexamethylphosphoric-triamide (680319), polychlorinated-biphenyls, 4,4'-diaminodiphenylmethane (101779), chloroform (67663), radon daughters, dimethylcarbamoyl- chloride (79447), diethylcarbamoyl-chloride (88108), explosive azide, inorganic arsenic (7440382), nitrosamines, beta-naphthylamine (91598), 2-nitropropane (79469), acrylonitrile (107131), 2,4- diaminoanisole (615054), tetrachloroethylene (127184), trimellitic- anhydride (552307), ethylene-thiourea (96457), disulfiram (97778), benzidine derived dyes, ethylene-dichloride (107062), NIAX Catalyst ESN, chloroethanes, vinyl-halides, glycidyl-ethers, epichlorohydrin (106898), tobacco smoke, arsine (7784421), radiofrequency sealers and heaters, formaldehyde (50000), ethylene-oxide (75218), silica flour (14808607), vibration, glycol-ethers, 2,3,7,8- tetrachlorodibenzo-p-dioxin (1746016), 1,3-butadiene (106990), cadmium (7440439), monohalomethanes, and dinitrotoluenes. Many of these commonly used chemicals and agents were associated with carcinogenic and central nervous system effects. Data concerning health effects were obtained from human and animal studies. NIOSH recommended that most of these substances be treated as potential human carcinogens and that work related exposures to these agents be reduced or eliminated wherever possible.