Which color on an NFPA label represents health hazards?

The color blue on an NFPA label specifically represents health hazards. In the NFPA (National Fire Protection Association) labeling system, each color serves a distinct purpose, and the blue section of the label is dedicated to indicating the potential health risks associated with a substance. The number within the blue section, ranging from 0 to 4, indicates the degree of health hazard; for instance, a rating of 0 suggests no health hazard, while a rating of 4 indicates a severe hazard requiring immediate action.

Understanding this labeling system is crucial, as it provides first responders and those handling materials with essential information quickly. Each color has its own significance—red indicates flammability, yellow denotes reactivity, and white typically refers to specific hazard information—reinforcing the importance of recognizing the blue section as the primary indicator of health-related risks.