What is American Conference Of Governmental Industrial Hygienists?

Legal Definition
The American Conference of Governmental Industrial Hygienists (ACGIH®) is a professional association of industrial hygienists and practitioners of related professions, with headquarters in Cincinnati, Ohio. One of its goals is to advance worker protection by providing timely, objective, scientific information to occupational and environmental health professionals.
-- Wikipedia
Legal Definition
A government agency that controls work exposure for chemicals and other agents. The limits are followed world wide.