If the following data was gathered during a sampling study of an employee handling solvents, would the employee be over-exposed?Assume the toxicological effects on the target organ are similar and additive.Monitoring yields results of 20 ppm exposure to toluene, 30 ppm exposure to xylenes, and 10 ppm to ethyl benzene.The TLVs TWAs are toluene 20 ppm;xylenes 100 ppm, and ethyl benzene 20 ppm.

TLV₁+C₂/ TLV₂+C₃/ TLV₃

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