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The relationship between the permissible exposure limit (PEL), the short-term exposure limit (STEL), ...

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The relationship between the permissible exposure limit (PEL), the short-term exposure limit (STEL), and the ceiling (C). The PEL and STEL may be exceeded for a certain amount of time as long as the ceiling is never exceeded. In each case the average concentration must remain below the appropriate value.
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