Under the hazard communications standard, all containers of hazardous chemicals must be what?

The requirement under the hazard communication standard is that all containers of hazardous chemicals must be labeled, tagged, or marked with appropriate hazard warnings. This is vital for ensuring that employees recognize and understand the potential dangers associated with these chemicals. Proper labeling provides essential information, such as the identity of the chemical, hazard warnings, and the appropriate precautions that should be observed when handling the substance.

This practice not only promotes safety in the workplace by informing staff about the risks they may encounter but also facilitates proper response actions in case of emergencies, such as spills or exposure. Understanding these details can significantly reduce the likelihood of accidents and enhance overall workplace safety regarding hazardous materials.

The other options, while relevant to chemical safety, do not specifically address the fundamental requirement of labeling as mandated by the standard.