How are hazardous materials defined?

Hazardous materials are defined as materials that possess properties that can cause harm to human health or the environment. This definition is crucial in the context of emergency response, safety regulations, and environmental protection. These substances can be toxic, flammable, reactive, or corrosive, posing risks during handling, transportation, storage, or disposal. Understanding this definition helps first responders identify potential dangers and implement appropriate safety measures and emergency protocols when dealing with hazardous incidents.

In contrast, the other options do not accurately represent the nature of hazardous materials. Substances that are safe and non-toxic do not fall within this definition, as they are not harmful. Everyday items that pose no threat are typically not classified as hazardous materials, and recyclable products do not necessarily indicate a hazard and could be safe for the environment. Therefore, only the correct answer accurately captures the essence of what constitutes hazardous materials in an emergency management context.