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Program concept
IMMISnet is a Gaussian multi-source dispersion model
for calculating the spatial extent of concentration levels of air
pollution. Treated as a stationary process, the model describes the
dilution and transport of pollutants from point, line or area sources,
using a Gaussian normal distribution. Gaussian dispersion models are
instruments that have been tried and tested for many years for dealing
with climatological concentration problems within the framework of plans
for maintaining air quality, or planning permit procedures, in line with
the German Technical Directive on Air Pollution Control (TA-Luft 1986).
On the basis of the Gaussian smoke plume equation, the model
calculates concentration contributions from the emissions of all the
area, line or point sources considered. Statistical parameters, such as
the mean annual value or the percentile of cumulative frequency, are
calculated for each of the defined receptors from the individual
concentrations determined for all the hours of a year. In addition,
IMMISnet can prepare all the background input data for microscale street
canyon models.
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