| | Definition: | | This is a guideline value defined by the American Conference of Governmental Hygienists to establish the airborne concentration of a potentially toxic substance to which it is believed that healthy working adults may be exposed safely through a 40 hour working week and a full working life. This concentration is measured as a time weighted average concentration. They are developed only as guidelines to assist in the control of health hazards and are not developed for use as legal standards. |
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