Which signal word indicates the highest level of acute toxicity?

• A. Warning
• B. Caution
• C. Danger
• D. None

Answer: (C)

Acute toxicity on pesticide labels is communicated with signal words that reflect how dangerous the product is with brief exposure. The strongest warning used is the word that signals the highest hazard, which is shown as Danger. This label indicates the product is highly toxic and requires strict precautions, such as rigorous personal protective equipment, careful handling, and avoidance of exposure routes like skin contact or inhalation.

Seeing Danger tells you this product poses a greater immediate risk than others labeled with Warning or Caution, which denote progressively lower levels of acute toxicity. None would not provide any warning about hazard, so it wouldn’t apply to a product that truly carries a high toxicity level.

So, the highest level of acute toxicity is indicated by Danger.