What does a highlighted green entry in the UN/NA number index signify?

• A. Toxic inhalation hazard
• B. Fire hazard
• C. Reactive hazard
• D. Explosive hazard

Answer: (A)

A highlighted green entry in the UN/NA number index signifies a toxic inhalation hazard. This classification is crucial for emergency responders and hazardous materials teams, as it indicates that the substance poses a significant risk if inhaled, potentially leading to severe health effects.

Understanding the color-coding in the UN/NA number index is vital for ensuring safety during hazardous materials incidents. The highlighted green specifically alerts responders to the acute inhalation toxicity associated with particular chemicals, emphasizing the need for protective measures, such as proper respiratory protection and mitigating exposure risks. This allows responders to prioritize safety protocols and treatment strategies effectively, thereby ensuring they handle such materials with the utmost caution.