Which type of substance is an environmental contaminant that causes harm to living organisms?

The answer to this question is a pollutant. An example of this are chemical pollutants which they have the ability to destroy and harm living things around them such as animals and plants. They could also harm human beings when they are exposed to it or when they have ingested it. It is because chemical pollutants has the ability to destroy the balance of the environment and destroy one's health.