What does the blue quadrant of NFPA 704 represent?

The blue quadrant of the NFPA 704 system represents health hazards. This system, also known as the National Fire Protection Association's labeling system, uses a diamond shape divided into four colored quadrants to convey information about the hazards of materials. The blue section specifically indicates the level of risk related to health effects associated with exposure to the material.

On a scale from 0 to 4, where 0 indicates no hazard and 4 represents a severe hazard, the blue quadrant provides vital information that can guide emergency responders and workers in managing those hazards effectively. Recognizing health risks is crucial for ensuring safety when handling hazardous materials, as it helps individuals understand the potential impacts on their health and the necessary precautions to take.

The other quadrants represent different types of hazards: flammability is shown in red, reactivity is indicated in yellow, and environmental impact is not explicitly represented in the NFPA 704 system.