In NFPA fire safety labeling, which hazards correspond to the blue, red and yellow sections respectively?

• A. Health, Flammability and Stability (or Reactivity)
• B. Temperature, Pressure and Humidity
• C. Toxicity, Corrosion and Reactivity
• D. Fire, Radiation and Noise

Answer: (A)

NFPA 704 labeling uses three color sections to convey different hazard types: blue indicates health hazard, red indicates flammability hazard, and yellow indicates instability (reactivity) hazard. Each section is rated from 0 to 4 to show how severe the hazard is, while the white section notes any special hazards. So the blue, red, and yellow sections correspond to health, flammability, and stability (or reactivity) respectively. Other options describe factors not part of this three-color system, such as temperature/pressure/humidity or toxicity/corrosion/reactivity, which aren’t the NFPA hazard dimensions.