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The English version of our glossary is currently under construction and will be regularly updated.

Trace gas

All gases found in the atmosphere in lower concentrations than the three main components nitrogen (78%), oxygen (21%) and argon (ca. 1%) are referred to as trace gases.

Generally speaking, refers to any gaseous component of the atmosphere apart from molecular oxygen (O2, 21%), molecular nitrogen (N2, 78%) and argon (ca. 1%).