Which signal word indicates the highest level of acute toxicity on a label?

• A. CAUTION
• B. DANGER (or Poison)
• C. WARNING
• D. NOTICE

Answer: (B)

Signal words on pesticide labels show how acutely toxic a product is, guiding how careful you need to be. The strongest warning is expressed as Danger, often paired with Poison, which signals the highest level of acute toxicity and immediate risk to health. That means exposure can cause severe harm, so the label requires the most protective precautions.

Caution indicates a relatively low hazard, and Warning indicates a higher hazard than Caution but not as severe as Danger. Notice isn’t used to denote acute toxicity on standard pesticide labels, so it doesn’t communicate the level of danger in the same way.

So the word that signals the highest acute toxicity is Danger (or Poison).