Which of the following is a possible indicator of a HAZMAT incident?

A visible leak or unusual odor is a significant indicator of a hazardous materials (HAZMAT) incident because these signs typically suggest that a substance classified as hazardous is being released into the environment. Hazards can come from various sources, such as industrial activities, transportation accidents, or containers that are damaged. The presence of noticeable smells or leaks allows responders to quickly identify the potential risk and the substance involved, enabling them to take appropriate safety measures. It can facilitate the rapid assessment of the situation, the safety of those nearby, and the initiation of emergency response protocols.

Other indicators, while important in specific contexts, are not as direct in signaling a HAZMAT incident. Unusual weather patterns could be caused by various natural phenomena and do not specifically indicate the presence of hazardous materials. Electrical power failures might suggest infrastructure issues but do not inherently point to a hazardous substance release. Traffic accidents can lead to HAZMAT situations but are not definitive indicators without additional signs such as visible leaks or odors. Thus, the clear visibility of leaks or detection of odors makes it an immediate and actionable indicator of a potential HAZMAT incident.