Which time basis is used for long-term exposure limit (LTEL) values?

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Multiple Choice

Which time basis is used for long-term exposure limit (LTEL) values?

Explanation:
Long-term exposure limit values are assessed using a time-weighted average over a standard reference period, typically 8 hours in a day or 40 hours in a week. This means exposure is evaluated as the average concentration over a worker’s daily shift or across a typical 5‑day workweek, to capture cumulative exposure and protect against chronic effects. Time bases like 12 hours per day or 24 hours per week don’t align with these standard reference periods, so they don’t represent LTELs. Therefore, the correct basis is the 8 hours per day or 40 hours per week reference.

Long-term exposure limit values are assessed using a time-weighted average over a standard reference period, typically 8 hours in a day or 40 hours in a week. This means exposure is evaluated as the average concentration over a worker’s daily shift or across a typical 5‑day workweek, to capture cumulative exposure and protect against chronic effects. Time bases like 12 hours per day or 24 hours per week don’t align with these standard reference periods, so they don’t represent LTELs. Therefore, the correct basis is the 8 hours per day or 40 hours per week reference.

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