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trace gas
A trace gas is a gas which makes up less than 1% by volume of the Earth's atmosphere, and it includes all gases except nitrogen (78.1%) and oxygen (20.9%). The most abundant trace gas at 0.934% is argon. Water vapor also occurs in the atmosphere with highly variable abundance.
==Natural sources==
Several atmospheric trace gases such as ozone , sulfur dioxide and nitrogen oxides are anthropogenic, chemically reactive factors of air quality at a regional level. Others such as carbon dioxide and methane are important greenhouse gases and are produced anthropogenically but mainly by plants, microorganisms and from natural geothermal sources. However, volcanic activity is an important source of trace gases as well.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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