pollutant

[puh-loot-nt]
noun
1.
something that pollutes.
2.
any substance, as certain chemicals or waste products, that renders the air, soil, water, or other natural resource harmful or unsuitable for a specific purpose.

Origin:
1890–95; pollute + -ant

nonpollutant, adjective, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pollutant (pəˈluːtənt)
 
n
a substance that pollutes, esp a chemical or similar substance that is produced as a waste product of an industrial process

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

pollutant pol·lut·ant (pə-lōōt'nt)
n.
Something that pollutes, especially a waste material that contaminates air, soil, or water.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
pollutant   (pə-lt'nt)  Pronunciation Key 
A substance or condition that contaminates air, water, or soil. Pollutants can be artificial substances, such as pesticides and PCBs, or naturally occurring substances, such as oil or carbon dioxide, that occur in harmful concentrations in a given environment. Heat transmitted to natural waterways through warm-water discharge from power plants and uncontained radioactivity from nuclear wastes are also considered pollutants.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Damp wood smolders and creates more of every pollutant.
Fuel duty has also served as a useful environmental weapon, since it accurately
  targets a pollutant and changes behaviour.
Ask students to describe what would happen if a certain type of pollutant,
  which kills a certain kind of fish, entered the bay.
Ask students what would happen if some kind of pollutant got onto the land.
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