On February 16, 2021, the Occupational Safety and Health Administration (OSHA) published a notice of proposed rulemaking to modify its Hazard Communication Standard (HCS) to conform to the latest revisions to the United Nations’ Globally Harmonized System of Classification and Labelling of Chemicals (GHS). Among the proposed changes, the rule would add classification categories for aerosols, desensitized explosives, and flammable gases, update select hazard and precautionary statements for clearer and more precise hazard information, and update labeling requirements for small containers and packaged containers that have been released for shipment. The proposed changes are intended to provide better alignment with other U.S. agencies and international trading partners without lowering overall protections. OSHA has preliminarily determined that the proposed revisions to the HCS will reduce costs and burdens while improving the quality and consistency of information regarding chemical hazards and associated protective measures. Comments are due to OSHA by April 19, 2021