Changes

'''Pollution''' is contamination of a system with harmful foreign components.<ref>http://www.m-w.com/cgi-bin/dictionary?book=Dictionary&va=pollution</ref> The most common usage of the word pollution refers to environmental pollution, which is contamination of the air, ground, or [[water]] by harmful [[chemical]]s or particulate matter. A less common use is noise pollution, which is "contamination" of a quiet space by annoying sounds.

'''Pollution''' is contamination of a system with harmful foreign components.<ref>http://www.m-w.com/cgi-bin/dictionary?book=Dictionary&va=pollution</ref> The most common usage of the word pollution refers to environmental pollution, which is contamination of the air, ground, or [[water]] by harmful [[chemical]]s or particulate matter. A less common use is noise pollution, which is "contamination" of a quiet space by disturbing sounds and can be disruptive to both human activities and wildlife.

==See also==

==See also==