Final answer:
The Hazard Communication Standard requires all employees to receive workplace hazard training, ensuring they are informed about chemical hazards in a language they understand.
Step-by-step explanation:
The requirement that mandates all employees' workplace hazard training is the Hazard Communication Standard. This standard is part of the regulations issued by the Occupational Safety and Health Administration (OSHA), which requires employers to inform and train employees on the hazardous chemicals they may be exposed to in the workplace. It also demands that the training is provided in a language and vocabulary that workers can understand. The training ensures that workers are aware of the risks and the procedures to follow to protect themselves and their co-workers. Other measures mentioned, such as standard precautions, bloodborne pathogen protocols, and emergency action plans, are also important but are targeted to specific hazards or emergencies. The Hazard Communication Standard has a broader scope, applying to any chemical hazard present in the workplace.