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Pollution is contamination of a system with harmful foreign components.[1]. The most common usage of the word pollution refers to environmental pollution, which is contamination of the air, ground, or water by harmful chemicals or particulate matter. A less common use is noise pollution, which is "contamination" of a quiet space by annoying sounds.

See also


  1. http://www.m-w.com/cgi-bin/dictionary?book=Dictionary&va=pollution
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