Which color represents health hazard on the NFPA diamond?

Which color represents health hazard on the NFPA diamond?

• A. Red
• B. White
• C. Blue
• D. Yellow

Answer: (C)

Blue is the color that signals health hazard in the NFPA 704 diamond. In this system, the four colored sections represent different hazard types: blue for health, red for flammability, yellow for reactivity, and white for special hazards. The numbers inside the blue area (0–4) indicate how severe the health risk is, with higher numbers meaning greater risk to health from exposure. Remembering blue as the health clue helps you quickly read the chart: health concerns are shown in the blue quadrant, while the others map to their respective hazards.

Blue is the color that signals health hazard in the NFPA 704 diamond. In this system, the four colored sections represent different hazard types: blue for health, red for flammability, yellow for reactivity, and white for special hazards. The numbers inside the blue area (0–4) indicate how severe the health risk is, with higher numbers meaning greater risk to health from exposure. Remembering blue as the health clue helps you quickly read the chart: health concerns are shown in the blue quadrant, while the others map to their respective hazards.