This report presents the criteria and the recommended standard based thereon which were prepared to meet the need for preventing occupational disease arising from exposure to inorganic lead (lead oxides, metallic lead, and lead salts, including organic salts, such as lead soaps but excluding lead-arsenate). The proposed standard applies only to the processing, manufacture, and use of lead products as applicable under the Occupational Safety and Health Act of 1970. The occupational safety and health aspects of the mining and milling of lead ores are covered by provisions of the Federal Metal and Nonmetallic Mine Safety Act (30 U.S.C. 725 et seq.) under which provisions the Bureau of Mines has responsibility. These criteria were developed to assure that the standard based thereon would (1) protect against development of acute and chronic plumbism, (2) be measurable by techniques that are valid, reproducible, and available to industry and governmental agencies, and (3) be attainable with existing technology.