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The severity of the harm caused by a pollutant depends on its chemical nature, concentration and persistence. Such pollutants can be man-made or natural. Anthropogenic contribution to pollution is particularly significant, especially due to combustion, construction, warfare and mining.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.