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A '''pollutant''' is any substance introduced into the [[natural environment]] that adversely affects the usefulness of a [[natural resource]] or the [[health]] of [[human]]s, [[animal]]s, or [[ecosystem]]s.<ref name=EPAGlossary>[http://www.epa.gov/OCEPAterms/vterms.html Terms of Environment: Glossary, Abbreviations and Acronyms] [[U.S. Environmental Protection Agency]]. Retrieved February 20, 2009.</ref> Pollutants can be artificial substances, such as [[pesticides]] and [[fossil fuel]] [[combustion]] products, or naturally occurring substances, such as [[radon]] (Rn) or [[carbon dioxide]] (CO<sub>2</sub>) that may occur in harmful [[concentration]]s in a given natural environment.  
A '''pollutant''' is any substance introduced into the [[natural environment]] that adversely affects the usefulness of a [[natural resource]] or the [[health]] of [[human]]s, [[animal]]s, or [[ecosystem]]s.<ref name=EPAGlossary>[http://www.epa.gov/OCEPAterms/vterms.html Terms of Environment: Glossary, Abbreviations and Acronyms] [[U.S. Environmental Protection Agency]]. Retrieved February 20, 2009.</ref> Pollutants can be artificial substances, such as [[pesticides]] and [[fossil fuel]] [[combustion]] products, or naturally occurring substances, such as [[radon]] (Rn) or [[carbon dioxide]] (CO<sub>2</sub>) that may occur in harmful [[concentration]]s in a given natural environment.  


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== Air pollutants==
== Air pollutants==
{{main|Air pollution}}
{{main|Air pollution}}
There are a great many types of air pollutants. The most notable ones are:
There are a great many types of air pollutants. The most notable ones are:
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==Air and water pollutants==
==Air and water pollutants==
{{main|Air pollution|Water pollution}}
{{main|Air pollution|Water pollution}}
There are also a great many pollutants which may contaminate either air or water:
There are also a great many pollutants which may contaminate either air or water:


*[[Heavy metal (chemistry)|Heavy metals]] such as [[arsenic]] (As), [[chromium]] (Cr), [[cadmium]] (Cd) or [[mercury]] (Hg) which are metallic [[elements]] with high [[atomic weight]]s, can damage living things at low concentrations and tend to accumulate in the [[food chain]].<ref name=EPAGlossary/>
*[[Heavy metal]]s such as [[arsenic]] (As), [[chromium]] (Cr), [[cadmium]] (Cd) or [[mercury]] (Hg) which are metallic [[elements]] with high [[atomic weight]]s, can damage living things at low concentrations and tend to accumulate in the [[food chain]].<ref name=EPAGlossary/>


*[[Persistent organic pollutant]]s (POPs) such as [[aldrin]], [[chlordane]], [[DDT]], [[dieldrin]], [[dioxins]],  [[endrin]], [[furans]], [[heptachlor]], [[hexachlorobenzene]], [[mirex]], [[polychlorinated biphenyls]] (PCBs), and [[toxaphene]].<ref>{{cite web|title=The Dirty Dozen|url=http://www.unido.org/doc/29428|publisher=[[United Nations Industrial Development Organization]]|accessdate=February 20, 2009}}</ref><ref>{{cite web|title=Persistent organic pollutants|author=L. Ritter, K.R. Solomon, J. Forget, M. Stemeroff and C. O'Leary|url=http://www.chem.unep.ch/pops/ritter/en/ritteren.pdf|publisher=[[United Nations Environment Programme]]|accessdate=February 20,2009}}</ref>
*[[Persistent organic pollutant]]s (POPs) such as [[aldrin]], [[chlordane]], [[DDT]], [[dieldrin]], [[dioxins]],  [[endrin]], [[furans]], [[heptachlor]], [[hexachlorobenzene]], [[mirex]], [[polychlorinated biphenyls]] (PCBs), and [[toxaphene]].<ref>{{cite web|title=The Dirty Dozen|url=http://www.unido.org/doc/29428|publisher=[[United Nations Industrial Development Organization]]|accessdate=February 20, 2009}}</ref><ref>{{cite web|title=Persistent organic pollutants|author=L. Ritter, K.R. Solomon, J. Forget, M. Stemeroff and C. O'Leary|url=http://www.chem.unep.ch/pops/ritter/en/ritteren.pdf|publisher=[[United Nations Environment Programme]]|accessdate=February 20,2009}}</ref>
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*[[Polycyclic aromatic hydrocarbon]]s (PAHs) are a large group of chemical compounds consisting of fused aromatic rings such as [[benzo(a)pyrene]], [[benzanthracene]], [[benzo(b)fluoranthene]], [[fluoranthene]], [[naphthalene]] to name but a few. They are formed during the incomplete combustion of [[carbon]]-containing substances and they are also manufactured for use as [[dye]]s, [[plastic]]s and pesticides.<ref>[http://www.atsdr.cdc.gov/tfacts69.html#bookmark08 ToxFAQs for Polycyclic Aromatic Hydrocarbons (PAHs)] [[Agency for Toxic Substances and Disease Registry]]. Retrieved February 20, 2009.</ref><ref>[http://dhs.wisconsin.gov/eh/chemfs/fs/PAH.htm Polycyclic Aromatic Hydrocarbons (PAHs)] [[Wisconsin Department of Health Services]]. Retrieved February 20, 2009.</ref>
*[[Polycyclic aromatic hydrocarbon]]s (PAHs) are a large group of chemical compounds consisting of fused aromatic rings such as [[benzo(a)pyrene]], [[benzanthracene]], [[benzo(b)fluoranthene]], [[fluoranthene]], [[naphthalene]] to name but a few. They are formed during the incomplete combustion of [[carbon]]-containing substances and they are also manufactured for use as [[dye]]s, [[plastic]]s and pesticides.<ref>[http://www.atsdr.cdc.gov/tfacts69.html#bookmark08 ToxFAQs for Polycyclic Aromatic Hydrocarbons (PAHs)] [[Agency for Toxic Substances and Disease Registry]]. Retrieved February 20, 2009.</ref><ref>[http://dhs.wisconsin.gov/eh/chemfs/fs/PAH.htm Polycyclic Aromatic Hydrocarbons (PAHs)] [[Wisconsin Department of Health Services]]. Retrieved February 20, 2009.</ref>


*[[Volatile organic compound]]s (VOCs) are defined: by the [[European Union]]<ref>[http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:32004L0042:EN:NOT Directive 2004/42/CE of the European Parliament] EUR-Lex website. Retrieved February 20, 2009.</ref> as [[organic chemicals]] having a [[normal boiling point]] of 250 °C (482 °F) or less; by [[Canada]]<ref>[http://www.hc-sc.gc.ca/ewh-semt/pubs/air/office_building-immeubles_bureaux/organic-organiques-eng.php Volatile Organic Compounds] [[Health Canada]]. Retrieved February 20, 2009.</ref> as organic chemicals that have normal boiling points roughly in the range of 50 − 250 °C (122 - 482 °F) and by the [[United States]]<ref name=EPAGlossary/> as organic chemicals that participate in atmospheric [[photochemical reaction]]s except those designated by [[U.S. Environmental Protection Agency]] as having negligible photochemical reactivity.
*[[Volatile organic compound]]s (VOCs) are defined: by the [[European Union]]<ref>[http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:32004L0042:EN:NOT Directive 2004/42/CE of the European Parliament] EUR-Lex website. Retrieved February 20, 2009.</ref> as [[organic chemicals]] having a [[normal boiling point]] of 250 °C (482 °F) or less; by [[Canada]]<ref>[http://www.hc-sc.gc.ca/ewh-semt/pubs/air/office_building-immeubles_bureaux/organic-organiques-eng.php Volatile Organic Compounds] [[Health Canada]]. Retrieved February 20, 2009.</ref> as organic chemicals that have normal boiling points roughly in the range of 50 − 250 °C (122 - 482 °F) and by the [[United States of America]]<ref name=EPAGlossary/> as organic chemicals that participate in atmospheric [[photochemical reaction]]s except those designated by [[U.S. Environmental Protection Agency]] as having negligible photochemical reactivity.


==Other pollutants==
==Other pollutants==
*[[Soil]] pollutants are chemicals released by spills or underground leakage.  Among the most significant are [[hydrocarbon]] liquids, heavy metals, [[methyl tert-butyl ether]] (MTBE)<ref>[http://www.epa.gov/mtbe/water.htm#concerns Concerns about MTBE] U.S. Environmental Protection Agency. Retrieved February 20, 2009</ref>, pesticides, [[herbicides]], and [[chlorinated hydrocarbons]].  
*[[Soil]] pollutants are chemicals released by spills or underground leakage.  Among the most significant are [[hydrocarbon]] liquids, heavy metals, [[methyl tert-butyl ether]] (MTBE)<ref>[http://www.epa.gov/mtbe/water.htm#concerns Concerns about MTBE] U.S. Environmental Protection Agency. Retrieved February 20, 2009</ref>, pesticides, [[herbicides]], and [[chlorinated hydrocarbons]].  
*[[Radioactive]] pollutants resulting from activities in [[atomic physics]], such as [[Nuclear power plant|nuclear power generation]] and nuclear weapons research, manufacture and deployment.  
*[[Radioactive]] pollutants resulting from activities in [[atomic physics]], such as [[Nuclear power plant|nuclear power generation]] and nuclear weapons research, manufacture and deployment.  
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==References==
==References==
{{reflist}}
{{reflist}}[[Category:Suggestion Bot Tag]]

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A pollutant is any substance introduced into the natural environment that adversely affects the usefulness of a natural resource or the health of humans, animals, or ecosystems.[1] Pollutants can be artificial substances, such as pesticides and fossil fuel combustion products, or naturally occurring substances, such as radon (Rn) or carbon dioxide (CO2) that may occur in harmful concentrations in a given natural environment.

Three factors determine the severity of a pollutant: its chemical composition, concentration and persistence.[2] Some pollutants are biodegradable and therefore will not persist in the natural environment in the long term.

Air pollutants

For more information, see: Air pollution.

There are a great many types of air pollutants. The most notable ones are:

Air and water pollutants

For more information, see: Air pollution and Water pollution.

There are also a great many pollutants which may contaminate either air or water:

Other pollutants

References

  1. 1.0 1.1 1.2 Terms of Environment: Glossary, Abbreviations and Acronyms U.S. Environmental Protection Agency. Retrieved February 20, 2009.
  2. Miller, G Tyler (1995). Environmental science: working with the Earth, 5th Edition. ITP. ISBN 0-534-21588-2. 
  3. National Ambient Air Quality Standards (NAAQS) U.S. Environmental Protection Agency. Retrieved February 20,2009.
  4. Earth's Greenhouse Gases University Corporation for Atmospheric Research. Retrieved February 9, 2009.
  5. The Dirty Dozen. United Nations Industrial Development Organization. Retrieved on February 20, 2009.
  6. L. Ritter, K.R. Solomon, J. Forget, M. Stemeroff and C. O'Leary. Persistent organic pollutants. United Nations Environment Programme. Retrieved on February 20,2009.
  7. ToxFAQs for Polycyclic Aromatic Hydrocarbons (PAHs) Agency for Toxic Substances and Disease Registry. Retrieved February 20, 2009.
  8. Polycyclic Aromatic Hydrocarbons (PAHs) Wisconsin Department of Health Services. Retrieved February 20, 2009.
  9. Directive 2004/42/CE of the European Parliament EUR-Lex website. Retrieved February 20, 2009.
  10. Volatile Organic Compounds Health Canada. Retrieved February 20, 2009.
  11. Concerns about MTBE U.S. Environmental Protection Agency. Retrieved February 20, 2009