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MAP20071018210Thresold limit values for chemical substances in workroom airSumario: Thresold limit values refer to airborne concentrations of substances and represent conditions under which it is believed that nearly all workers may be repeatedly exposed without adverse effect. The guides that gradually have become the most widely accepted are those issued by the American Conference of Governmental Industrial Hygienists, and termed Thresold limit values (TLVs)En: National safety news. - Chicago. - Vol. 119, nº 1, January 1979 ; p. 65-731. American Conference of Governmental Industrial Hygienists. 2. Higiene industrial. 3. Contaminantes químicos. 4. Sustancias tóxicas y peligrosas. 5. Valores TLV. 6. Contaminación atmosférica. 7. Estados Unidos. I. Título. II. Título: National safety news.