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to a gas or gases which make up less than 1% of the earth's atmosphere, which encompasses all occurring gasses except nitrogen and oxygen. Several are chemically reactive factors of air quality at a regional level, and others are important greenhouse gases. Most are anthropogenic, but plants and microorganisms are important sources in remote areas. The most common trace gas is argon and trace compounds include water vapor, carbon dioxide, methane, nitrogen oxides, and ozone.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Trace_gas". A list of authors is available in Wikipedia.|