Clearing the air

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<title>Clearing the air</title>
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<title>Safety & health</title>
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<namePart>Naso, Markisan</namePart>
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<abstract>OSHA established permissible  exposure limits, or PELs, for nearly 500 air contaminants, based on research conducted in the 1950s and 1960s. </abstract>
<note type="statement of responsibility">By Markisan Naso</note>
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<text>Vol. 167, nº 4, April 2003 ; p. 32-36</text>
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