In the N.F.P.A hazard system, what does the color blue indicate?

The color blue in the National Fire Protection Association (N.F.P.A.) hazard system specifically indicates a health hazard. This color is used to convey the level of potential harm that a substance can pose to human health, particularly in terms of toxicity or potential for injury.

In the N.F.P.A. system, the blue category is rated on a scale from 0 to 4, where 0 signifies that the material poses minimal or no health risk and 4 indicates that it can be fatal upon short exposure. This classification provides essential information for emergency responders and workers who may need to handle or come into contact with hazardous materials, ensuring that they are aware of the specific health risks associated with substances they are dealing with. Understanding this aspect of the N.F.P.A. hazard system is crucial for safety and risk management in various environments.