North Carolina Firefighter Hazardous Materials Practice Exam

NFPA 704 communicates hazards at a glance with a four-color diamond. Each quadrant represents a hazard type: blue for health, red for flammability (fire hazard), yellow for instability/reactivity, and white for special hazards. The red area is specifically for flammability, indicating how easily the material can ignite or sustain a fire. The numbers inside each color (0–4) show how severe that hazard is, with higher numbers meaning greater risk. So recognizing red tells responders right away that ignition and burning are primary concerns, guiding suppression plans, shipping and handling considerations, and necessary precautions. The other colors serve different purposes: blue relates to potential harm to health, yellow to how reactive the material is, and white to any special hazards like oxidizers or corrosive tendencies.