Associate Safety Professional Exam

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A chemical has a TWA-TLV of 50 ppm. Air sampling over an 8-hour shift yields the following results: 60 ppm for 3 hours, 40 ppm for 3 hours, and 55 ppm for 2 hours. What is the 8-hour TWA concentration?

51.25 ppm — exceeds the TLV 50.00 ppm — exactly at the TLV 48.75 ppm — below the TLV 55.00 ppm — equals the highest sample

Correct Answer:

51.25 ppm — exceeds the TLV

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