Clearing the air

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      <subfield code="a">OSHA established permissible  exposure limits, or PELs, for nearly 500 air contaminants, based on research conducted in the 1950s and 1960s. </subfield>
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      <subfield code="g">Vol. 167, nº 4, April 2003 ; p. 32-36</subfield>
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