pollutant

Etymology

pollute + -ant

noun

  1. A foreign substance that makes something dirty, or impure, especially waste from human activities.
    Acid rain forms when water in the atmosphere condenses on particles containing acid-forming pollutants, such as sulfate produced by the burning of fossil fuels and nitrogen oxides from automobile exhausts. 1987-01-20, “Airborne Pollutants”, in The New York Times, →ISSN

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