Which color indicator is commonly used in the NFPA hazard identification system for health hazards?

In the National Fire Protection Association (NFPA) hazard identification system, the color blue is utilized to indicate health hazards. This system employs a color-coded diamond format to provide quick visual information about the hazards associated with materials.

In this system, the blue section of the diamond specifically represents the health hazard rating, with a scale ranging from 0 to 4. A rating of 0 indicates no health risk, while a rating of 4 signifies a severe hazard—meaning that the substance poses a significant risk to health upon exposure.

Understanding the significance of the color blue in the NFPA labeling system is crucial for safety personnel, emergency responders, and anyone working with hazardous materials, as it facilitates quick assessments of risks associated with chemical exposure, thus aiding in appropriate safety measures and emergency response planning.