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TEXT VERSION OF SLIDE: Title: Maximum Use Concentration Example Type: Text Slide Content: What is the MUC for an employee wearing a half-mask air purifying respirator (APF=10) in an atmosphere of sulfur dioxide gas (PEL=5 ppm)? MUC = APF x OSHA Exposure Limit MUC = 10 x 5 ppm = 50 ppm Note that this calculated value does not exceed the IDLH level for sulfur dioxide (100 ppm), so that the MUC for this example would be 50 ppm.