Hazardous materials inventory includes substances that pose risks to health, safety, or the environment and require special handling, storage, and transportation. Examples include chemicals, flammable liquids, and compressed gases. Managing hazmat inventory involves compliance with regulations such as OSHA, EPA, and DOT standards. In supply chain management, tracking and optimizing hazmat inventory is vital to ensure safety, reduce liability, and avoid regulatory penalties. This often includes specialized storage facilities, detailed documentation, and trained personnel, which add complexity and cost to inventory operations.