CDM: Climatological Dispersion Model
CDM (Climatological Dispersion Model) is a classical air pollution
model based on the gaussian approximation and aimed at computing
the long term (monthly and annual) averages of air pollution concentration
in an urban area. The concentration at any number of receptors
is computed as the result of up to 2500 areal and 200 point sources
on flat terrain. It can compute two pollutants at the same time
and has been used for both SO2 and NOX.
The program is similar to AQDM, but uses a different method to
compute the effect of areal source, the plume rise, and the wind
velocity at different heights.
gaussian plume, areal sources, point sources,
urban site,long term.
You can download the software from
EPA - SCRAM Models
or directly: http://www.epa.gov/scram001/models/othreg/cdm2.zip
The model is part of UNAMAP (version 6). The code is available on diskette at:
National Technical Information Service
U.S Department of Commerce
tel (703) 487- 4650.
J. S. Irwin
Atmospheric Sciences Research Laboratory
RTP, NC 27711
T. Chico and J. Catalano
3303 Harbor Boulevard
Costa Mesa, CA 92626
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treatment of area source by the climatological dispesion AQDM:
air quality display model, 1972;
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Publication No. EPA r4-73- 024, 1973.
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air quality simulation Models, EPA Publication No. EPA 450/4-83-
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