Assigned Protection Factors (US Occupational Safety and Health Administration Regulation) (OSHA) (2018 Edition) The Law Library presents the complete text of the Assigned Protection Factors (US Occupational Safety and Health Administration Regulation) (OSHA) (2018 Edition). Updated as of May 29, 2018 In this final rule, OSHA is revising its existing Respiratory Protection Standard to add definitions and requirements for Assigned Protection Factors (APFs) and Maximum Use Concentrations (MUCs). The revisions also supersede the respirator selection provisions of existing substance-specific standards with these new APFs (except for the respirator selection provisions of the 1,3-Butadiene Standard). This book contains: - The complete text of the Assigned Protection Factors (US Occupational Safety and Health Administration Regulation) (OSHA) (2018 Edition) - A table of contents with the page number of each section