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A Guide for Employers

Department of Industrial Relations Division of Occupational Safety and HealthRev. April 2021 Respiratory Protection in the Workplace A Guide for EmployersContentsAbout This Guide 1 When Do Respirators Have To Be Used? 3 What is a Harmful Exposure? 3 How to Identify Harmful Exposures 3 How to Control Harmful Exposures 5 Voluntary Use of Respirators 6 Wildfires 6 Aerosol Transmissible Diseases 7 Immediately Dangerous to Life or Health (IDLH) Environments 7 Types of Respirators 8 Air-purifying Respirators (APR) 8 Atmosphere Supplying 9 Negative and Positive-pressure Respirators 10 Written Respiratory Protection Program 11 Selection of Respirators 12 Medical Evaluations 14 Fit T esting of Tight-fitting Respirators 15 Proper Respirator Use 17 Maintenance and Care of Respirators 19 Breathing Air Quality and Supply 20 Training and Information 22 Program

1. C (ceiling): maximum concentration of an airborne contaminant that an employee may be exposed to at any time. 2. PEL (permissible exposure level): The maximum permitted 8-hour time-weighted average concentration of an airborne contaminant. 3. STEL (short term exposure level): A 15-minute (or sometimes other than 15 minutes,

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