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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

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