MAP20071018314 Threshold limit values for physical agents : adopted by ACGIH for 1979 Sumario: The threshold limit values reproduced here refer to levels of physical agents and represent conditions under which it is believed that nearly all workers may be repeatedly exposed day after day without adverse effect En: National safety news. - Chicago. - Vol. 120, nº 5, November 1979 ; p. 71-78 1. American Conference of Governmental Industrial Hygienists . 2. Higiene industrial . 3. Contaminantes físicos . 4. Valores TLV . 5. Estrés térmico . 6. Radiaciones ionizantes . 7. Láser . 8. Ruido . 9. Estados Unidos . I. Title. II. Título: National safety news.