In the NFPA 704 rating system, which color code indicates health hazards?

In the NFPA 704 rating system, which color code indicates health hazards?

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

Answer: (A)

In NFPA 704, the color blue is used to signify health hazards. The system places four colored fields in a diamond to quickly convey risks: blue for health, red for flammability, yellow for reactivity, and white for special hazards. Each colored area is numbered 0–4 to show how severe the hazard is, with higher numbers meaning greater risk. So recognizing blue tells you the material poses health-related risks to exposed people, while the other colors point to flammability (red), reactivity (yellow), and any special hazards (white).

In NFPA 704, the color blue is used to signify health hazards. The system places four colored fields in a diamond to quickly convey risks: blue for health, red for flammability, yellow for reactivity, and white for special hazards. Each colored area is numbered 0–4 to show how severe the hazard is, with higher numbers meaning greater risk. So recognizing blue tells you the material poses health-related risks to exposed people, while the other colors point to flammability (red), reactivity (yellow), and any special hazards (white).