What is the definition of a hazardous material (hazmat)?

The definition of a hazardous material (hazmat) pertains specifically to substances that have the potential to pose an unreasonable risk to health, safety, and property when they are transported in commerce. This definition encompasses a broad range of materials, which can include chemicals, biological agents, and certain types of waste that, under specific conditions, can harm individuals, the environment, or property.

The key aspect of this definition is the emphasis on "unreasonable risk," which means that while not all materials that could be hazardous are always harmful, their potential for causing danger in certain scenarios—especially during transportation—demands strict regulations and safety measures. Hazmats can vary significantly in their properties; some might be toxic, flammable, or reactive, leading to the need for careful handling and compliance with regulatory guidelines.

This understanding is crucial in fields such as radiation safety and transportation, where professionals must be able to identify and mitigate the risks associated with various hazardous materials to ensure safety for both human health and the environment.