Which of the following is NOT a primary risk posed by Hazmat events?

In the context of HazMat events, the primary risks typically involve the potential for immediate harm to people and the environment. Fire, health hazards, and chemical reactivity are all direct threats that can result from hazardous material spills, leaks, or accidents.

Fire is a significant risk, especially when flammable materials are involved, as they can ignite and cause explosions or widespread damage. Health is critical as exposure to hazardous substances can lead to acute or chronic health issues for responders and nearby populations. Reactivity also poses a danger since some materials can react violently when combined with other substances, leading to dangerous situations.

Traffic, while it can be a secondary concern in a HazMat scenario (for example, when people or vehicles need to navigate an emergency scene), is not a primary risk associated with the hazardous materials themselves. Instead, it is more related to the logistics and management of responding to the event, rather than a direct consequence of the hazardous materials involved. Therefore, it is reasonable to identify traffic as the option that does not represent a primary risk posed by HazMat events.