The term "hazardous materials" or "hazardous waste" is defined somewhat differently depending on the regulatory agency or association involved.
Alberta Workplace Health and Safety definition of "hazardous substance" covers any chemical that presents a risk to an employee who has chemicals in their workplace.
- The Department of Transport (DOT) uses the term "hazardous materials" to cover any chemical that falls into one of 11 hazard classes such as explosives, poisonous materials or corrosive.