How is "hazardous material" defined?

• A. Any chemical that is flammable
• B. A substance that poses a risk only to the environment
• C. A material in quantities that may threaten health or safety
• D. A material that is only harmful if ingested

Answer: (C)

The definition of "hazardous material" encompasses any substance or material that, due to its quantity, concentration, or physical, chemical, or biological properties, poses a potential risk to health and safety. This means substances that can cause harm to humans, property, or the environment if not handled properly. The correct answer highlights that hazardous materials can exist in various forms and that their threat can arise from exposure even without ingestion—through inhalation, skin contact, or environmental release.

In contrast, the first option limits hazardous materials to flammable substances, which does not cover the full spectrum of potential hazards across different materials. The second option incorrectly suggests that a substance's risk is solely regarding environmental threats, ignoring health risks to humans. The fourth option confines hazardous materials to those that are harmful only when ingested, which is a narrow definition that overlooks other routes of exposure. Thus, the comprehensive nature of the correct option accurately reflects the broader understanding of hazardous materials in the context of health and safety.