The System Hazard NFPA Diamond is what NFPA number?

• A. 704
• B. 30
• C. 55
• D. 70

Answer: (A)

The system hazard diamond is defined by NFPA 704, the Hazard Identification System. This standard creates the four-quadrant color-coded diamond used to communicate hazards at a glance: blue for health, red for flammability, yellow for reactivity, and white for special hazards. The numbers 0–4 in the blue, red, and yellow sections indicate increasing severity of the respective hazards, with 0 meaning no hazard and 4 indicating severe hazard. This labeling system is specifically designed to convey a quick, at-a-glance understanding of a material’s hazard level in workplaces, labs, and emergency responses.

The other NFPA numbers refer to different standards that cover topics unrelated to this hazard identification diamond (for example, electrical installations or the handling of flammable liquids). That’s why NFPA 704 is the correct reference for the System Hazard Diamond.