During which phase do acute health effects typically occur?

Acute health effects occur immediately upon exposure to a hazardous substance. This response is typically characterized by a rapid onset of symptoms or reactions. For instance, if an individual is exposed to a toxic chemical or an irritant, they may experience symptoms like respiratory distress, skin irritation, or chemical burns very soon after contact.

These immediate effects are particularly critical because they can signal the need for urgent medical attention and immediate action to mitigate further exposure. In contrast, other phases, such as chronic exposure or prolonged exposure, usually involve health effects that develop over time, rather than manifesting instantly. Understanding the difference between acute and chronic effects is essential in hazardous materials management, as it guides appropriate emergency response and health risk assessments.