Industrial Hygiene Exposure Assessment: The Good, Bad, and
Industrial Hygiene Exposure Assessment: The Good, Bad, and
Industrial Hygiene Exposure Assessment: The Good, Bad, and
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1977 NIOSH Guidance<br />
� LCL95% <strong>and</strong> UCL95%<br />
� LCL95% =Mean/PEL -1.645* CVtotal/√n<br />
� UCL95% =Mean/PEL +1.645* CVtotal/√n<br />
� UCL ≤ 1 – No violation<br />
� LCL > 1 – Violation<br />
� LCL ≤ 1 <strong>and</strong> UCL > 1 – Possible Overexposure<br />
� Xylene Example