Acute toxicity is related to:

• A. The chronic effects over years
• B. The immediate effects after a single exposure, or within a 24 hour period
• C. The environmental persistence
• D. The hazard to aquatic life

Answer: (B)

Acute toxicity refers to harmful effects that appear soon after a single exposure or within a short time, typically within 24 hours. This is exactly what the term describes: rapid, short-term adverse effects from one event rather than from long-term, repeated exposure. In welding safety, recognizing acute toxicity helps you understand risks from a one-time inhalation of fumes or skin contact with a toxic substance, where symptoms can come on quickly. By contrast, chronic toxicity involves effects that develop over years of repeated exposure, environmental persistence is about how long a chemical remains in the environment, and hazards to aquatic life describe ecotoxicity.