Air pollution exposures to five target health hazards.

The Occupational Safety and Health Administration (OSHA) initiated a Target Health Hazards Program (THHP) in January 1972. The five substances singled out as target health hazards (asbestos, cotton dust, carbon monoxide, lead and silica) are discussed. Outlines are given of the pertinent points of the present and proposed OSHA standards for each substance as well as data of OSHA inspection efforts with regard to the THHP. A summary statement is made of the National Emphasis Program and of OSHA efforts to upgrade standard setting and compliance activities.