Products
Your Partner for Air Pollution Mapping
IMMI for dispersion calculation of gaseous, odorous and dust pollutants
IMMI covers a wide range of applications ranging from noise mapping to air pollution modelling. IMMI integrates both noise and air pollution in a single software package. In this section we will concentrate on the features of IMMI specifically designed for air pollution mapping and dispersion modelling. With its modular design and price-list, IMMI can be adapted to user's needs and budgets - ask for details!
IMMI is continuously readjusted to meet the requirements of evolving regulations and standards. Currently IMMI can be equipped with
- Gaussian and Langrangian air pollution dispersion models from Germany and Austria
- air pollution dispersion calculation methods for industrial and road traffic sources
Regional air pollution mapping gained additional importance with the arrival of EU's 1996 Air Framework Directive and the subsequent pollutant-specific Daughter Directives. Modelling is an assessment technique specifically referenced in the Daughter Directives. IMMI contains algorithms that can be used for small-, medium- and large-scale mapping and is thus suitable for everything from assessment of pollution in the vicinity of polluting sources up to regional air-pollution modelling of the Daughter Directives.
General-purpose Gaussian model
IMMI – the universal environmental pollution software – features a fully operational Gauss model in its base module. The model is based on the proven German TA-Luft, Annex C of 1986.
Features:
- Dispersion calculation for gaseous and odorous pollutants and dust, e. g. SO2, NOx, NO2, NH3, CO, CO2 ...
- Point, line and area sources.
- Effective source height for cold and warm exhaust gases.
- Odours: Percentage of hours of a year with odour perception.
- Calculation of receptor grids or single user-defined receivers.
- Calculation of odour streams for livestock.
For further information see 
Log-In area.
Langrangian air dispersion model - AUSTAL2000
IMMI's comfortable data editing and mapping features are used with the official German implementation of the Langrangian model compliant with VDI 3945-3. IMMI acts as the user-interface whereas AUSTAL2000 is used as the Langrangian calculation kernel. The development of this common calculation kernel was funded by the German government to have a single unified code compliant with Annex 3 of the German Technical Instructions on Air of 2002 (TA-Luft 2002). TA-Luft 2002 and AUSTAL2000 are central elements of the German transposition of the European Air Quality Directive and daughter Directives. All data transfers between IMMI and AUSTAL2000 are automatically managed and remain perfectly transparent to the user, who never interacts with the calculation kernel directly. The whole digitising of the project is done as usual in IMMI. All GIS functionality, all functions and commands to enter and edit data as well as all features to present and export calculated results can be used.
Features:
- Simultaneous calculation for up to 51 gaseous and particular pollutants (SO2, NOx, NO2, Bzl, TCE, F, NH3, PM, As, Pb, Cd, Ni, Hg, Tl, xx and ODOR (odour)
- Point, line and area sources and also volume and vertical sources
- IPPC: Ambient air quality directive
- Gases: Calculation of fields of concentration for the assessment periods year, day, hour (pollutant-dependent)
- Dust particles: Calculation of both sedimentation and deposition for the assessment periods year, day, hour (pollutant-dependent)
- Wind-field calculation takes variations in terrain level and obstacles into account
- Calculations use statistical meteorological data (wind speed, wind direction and stability classes)
For further information see Log-In area.