A substance, gaseous material or
aerosol which has been introduced into the air (either by human activity or by natural processes)
in sufficient concentration to produce a measurable effect on humans, animals, vegetation
or materials (monuments, etc.):
SO2,
NO2,
H2S,
CO,
hydrocarbons, etc.
Source:
PAC, 1990, 62, 2167
(Glossary of atmospheric chemistry terms (Recommendations 1990))
on page 2172
Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
https://doi.org/10.1351/goldbook.
