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

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

Answer: (B)

The NFPA 704 system is widely used for identifying the hazards of materials through a color-coded system on placards. In this system, colors are assigned specific meanings related to different types of hazards.

The blue color in the NFPA 704 system specifically represents health hazards. This means that when you see a blue section on a placard, it indicates the potential dangers that could affect an individual's health upon exposure to the material. The blue section contains a numerical rating that indicates the severity of the health risk, ranging from 0 (no hazard) to 4 (extreme hazard). This enables first responders and individuals handling hazardous materials to take appropriate precautions to protect themselves from health risks.

Understanding this system is crucial for emergency response and safety planning, as it allows personnel to quickly assess the potential threats posed by various substances they may encounter.