MAP20071503599 Naso, Markisan Clearing the air / By Markisan Naso OSHA established permissible exposure limits, or PELs, for nearly 500 air contaminants, based on research conducted in the 1950s and 1960s. En: Safety & health. - Itasca. - Vol. 167, nº 4, April 2003 ; p. 32-36 1. Riesgo químico . 2. Industria química . 3. Enfermedades profesionales . 4. Contaminación del aire . 5. Higiene industrial . 6. Contaminantes químicos . 7. Valores TLV . 8. Estados Unidos . I. Title. II. Título: Safety & health.
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