Practice question

In NFPA 704 placards, which color indicates Health hazard?

  1. Blue
  2. Red
  3. Yellow
  4. White

Answer: A — Blue

NFPA 704 placards use a four-color diamond to signal hazard types. The blue section is for health hazards, red for flammability, yellow for reactivity, and white for special hazards. The numbers in each colored area (0–4) indicate how severe the hazard is to health. So the color indicating Health hazard is blue. Seeing blue helps responders gauge potential health risks in order to choose appropriate PPE and approach safely. Red is about flammability, yellow about reactivity, and white carries special handling notes or symbols.

Practice more: Alabama Fire College HAZMAT Technician Practice Test →