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A worker is exposed to dust at 3 mg/m3 for 4.0 hrs, at 2 mg/m3 for...

A worker is exposed to dust at 3 mg/m3 for 4.0 hrs, at 2 mg/m3 for 3 hrs, and 9 mg/m3 of dust for 1.0 hrs. What is the TWA? Include the correct units.

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Answer #1

ITWA is the sum of time of dust exposed multiplied by concentration of dust which is completely divided by total time. It

It is expressed in mg/m3 or ppm.

TWA = 3.375 mg/m3.

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