Which color on the NFPA diamond indicates the level of health hazard?

The blue color on the NFPA (National Fire Protection Association) diamond specifically indicates the level of health hazard. This color represents the health risks posed by a material, with a scale from 0 to 4, where 0 indicates no hazard and 4 indicates a severe hazard to health. The blue section allows workers and emergency responders to quickly assess the potential health risks of a substance, ensuring that proper safety measures and personal protective equipment can be utilized effectively.

In the context of the NFPA diamond, the other colors serve distinct purposes: red indicates flammability hazards, yellow signifies reactivity hazards, and white is used for specific information or special hazards. Understanding the significance of these colors is crucial for maintaining safety in environments where hazardous materials are present.