Explain 20ppm methylene chloride and 20 ppm turpentine

Reference no: EM13700583

Question- If the 8 hour Time Weighted Average exposure are determined by charcoal tube sampling to be 60ppm toluene, 20ppm methylene chloride, and 20 ppm turpentine, using OSHA's personel exposure limits, has there been an over exposure?

Please show me how work it out above problem

Reference no: EM13700583

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