Which of the following colors represents health hazards in the NFPA 704 system?

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

Answer: (B)

In the NFPA 704 system, which is a standardized labeling system for hazardous materials, the color blue is specifically used to represent health hazards. This is important for quick identification by emergency responders and personnel dealing with hazardous substances.

The blue section of the label includes a numerical scale from 0 to 4, where 0 indicates no hazard and 4 represents a severe hazard to health. This system allows firefighters and other responders to assess the level of risk associated with a material at a glance. Understanding this color-coding is crucial for ensuring safety during incidents involving hazardous materials, as it helps emergency personnel take the necessary precautions when approaching a scene or handling such materials.

Other colors in the NFPA system are designated for different categories: red signifies flammability, yellow indicates reactivity, and white is used for specific hazards. This distinction is vital for proper emergency response and public safety.