Which NFPA 704 color indicates health hazard?

Which NFPA 704 color indicates health hazard?

• A. Health (blue)
• B. Flammability (red)
• C. Reactivity (yellow)
• D. Special information (white)

Answer: (A)

NFPA 704 uses a diamond with four colored sections to signal different hazard types. The blue area flags health hazards, indicating potential injury or illness from exposure. The number inside the blue section (0–4) shows how severe the health risk is, with higher numbers meaning greater danger. This color-coding helps responders quickly assess risk and decide on protective measures before and during handling. The other colors cover separate hazards: red for flammability, yellow for reactivity, and white for special information like oxidizers or specific handling instructions. So, the color indicating health hazard is blue.

NFPA 704 uses a diamond with four colored sections to signal different hazard types. The blue area flags health hazards, indicating potential injury or illness from exposure. The number inside the blue section (0–4) shows how severe the health risk is, with higher numbers meaning greater danger. This color-coding helps responders quickly assess risk and decide on protective measures before and during handling. The other colors cover separate hazards: red for flammability, yellow for reactivity, and white for special information like oxidizers or specific handling instructions. So, the color indicating health hazard is blue.