Which hazard degree indicates 'extreme danger'?

The degree that indicates "extreme danger" is rated at level 4. This rating is part of a hazard communication standard that categorizes hazards based on their potential to cause harm or adverse effects. An extreme danger designation typically corresponds to situations or substances that pose a significant threat to health, safety, or the environment. This could include explosives, toxic chemicals, or other hazardous materials that require stringent controls and precautions.

In this system, lower numbers represent less severe hazards. A rating of 1 indicates a minimal danger, while a 2 signifies a moderate hazard. A rating of 3 represents a serious or high level of danger, but not to the extreme level designated by a 4. Therefore, identifying and understanding the highest hazard degree as indicating extreme danger is crucial for appropriate safety measures and effective emergency response.