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1540s, "one who renders unclean or impure," agent noun from pollute (v.). Ecological sense from 1958.
pollute pol·lute (pə-lōōt')
v. pol·lut·ed, pol·lut·ing, pol·lutes
To make unfit for or harmful to living things, especially by the addition of waste matter; contaminate.
To make less suitable for an activity, especially by the introduction of unwanted factors.