Which color indicates the presence of a reactivity hazard in the NFPA system?

In the National Fire Protection Association (NFPA) labeling system, the color that indicates the presence of a reactivity hazard is indeed yellow. The NFPA diamond uses a color-coded system to communicate the hazards associated with materials. Each color corresponds to a different type of hazard: blue signifies health hazards, red indicates flammability, yellow represents reactivity, and white is used for specific hazards.

The yellow section of the NFPA label displays a numerical rating ranging from 0 to 4, with 0 indicating minimal reactivity and 4 indicating extreme reactivity. This helps first responders identify and assess the hazards effectively when responding to incidents involving hazardous materials. Understanding these colors and their meanings is crucial for safety in environments where hazardous materials are present.