What does the blue section of the NFPA diamond indicate?

The blue section of the NFPA (National Fire Protection Association) diamond represents health hazards. This section is crucial for emergency responders and personnel who may encounter hazardous materials, as it provides specific information about the potential health risks associated with exposure to that substance.

The numbers in the blue section range from 0 to 4, with 0 representing minimal risk to health and 4 indicating a severe health hazard that could be life-threatening upon exposure. Understanding this section allows responders to determine appropriate personal protective equipment (PPE) and strategies to mitigate health risks while handling or responding to incidents involving hazardous materials.