pol·lu·tion
/pəˈlo͞oSH(ə)n/
noun
the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects.
"the level of pollution in the air is rising"
synonyms: contamination, contaminating, adulteration, adulterating, tainting, impurity, fouling, befouling, foulness, dirtiness, dirtying, soiling, filthiness, infection, infecting
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Pollution
Pollution is the introduction of contaminants into the natural environment that cause adverse change. Pollution can take the form of any substance or energy. Pollutants, the components of pollution, can be either foreign substances/energies or... Wikipedia