Pollutant

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Definition of Pollutant:
A contaminant that in a certain concentration or amount will adversely alter the physical, chemical, or biological properties of the environment. It includes pathogens, heavy metals, carcinogens, oxygen-demanding materials, and all other harmful substances and waste products.<ref>CoPraNet glossary
This is the common definition for Pollutant, other definitions can be discussed in the article

References