A more thorough explanation:

Definition: A hazardous substance is a toxic pollutant or an imminently dangerous chemical or mixture that may cause harm to human health or the environment. It can also refer to refuse or superfluous material, especially that remaining after a manufacturing or chemical process.

Examples: Examples of hazardous substances include toxic waste, such as dichlorodiphenyltrichloroethane (DDT), and other substances that may cause harm to human health or the environment. Hazardous substances can be found in many industries, including manufacturing, agriculture, and healthcare.

Explanation: Hazardous substances are dangerous and can cause harm to human health and the environment. They need to be handled and disposed of properly to prevent harm. For example, toxic waste needs to be disposed of in a way that does not harm the environment or human health. Hazardous substances can also be found in workplaces, and employees need to be trained on how to handle them safely to prevent accidents and injuries.