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what is the time weighted average of worker exposure to xylenes based on period duration of 60 minutes, 30 minutes, 240 minutes, 50 minutes and

what is the time weighted average of worker exposure to xylenes based on period duration of 60 minutes, 30 minutes, 240 minutes, 50 minutes and 100 minutes with contaminant concentrations of 10 ppm, 160 ppm, 30 ppm, 145 ppm and 40 ppm

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