The gaseous and
aerosol effluents which are emitted from a chimney and the volume of space which they occupy
(often
visible). The shape of the plume and the concentrations of pollutants in it at various points
along the path of the plume are sensitive functions of the meteorology, local topography
and the chemistry which occurs in the plume. Urban plumes are observed over many urban
areas and downwind of these areas in which a combination of man sources of pollution
are concentrated.
Source:
PAC, 1990, 62, 2167
(Glossary of atmospheric chemistry terms (Recommendations 1990))
on page 2207