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Slide 34


    Title: Maximum Use Concentration (MUC)
    Type: Text Slide

    • The maximum atmospheric concentration of a hazardous substance from which an employee can be expected to be protected when wearing a respirator, and is determined by the assigned protection factor of the respirator or class of respirators and the exposure limit of the hazardous substance

    • MUC = APF x OSHA Exposure Limit1
    1When no OSHA exposure limit is available for a hazardous substance, the employer must determine an MUC on the basis of relevant available information and informed professional judgment.