Precise Noise Prediction in Numerous Areas of Application

Whether ISO 9613-2 or CNOSSOS-EU – IMMI supports you in any aspect concerning noise immission control

Depending on the type of noise and the legal requirements of the country, the calculation is based on the relevant dispersion model. You will be supported by individual program functions according to your application. In addition to outdoor sound propagation, IMMI also allows the calculation of sound propagation in rooms, including a function for room acoustic design according to DIN 18041 and the propagation of air pollutants.

You can use IMMI for 

  • Calculating industrial noise
    IMMI supports you with any question in the field of industrial noise – from the calculation of a new supermarket according to TA Lärm, the assessment of sports or leisure facilities as well as the calculation and assessment of construction noise.

  • Calculating traffic noise
    IMMI is best suited for the calculation of traffic noise according to 16. BImSchV or conveniently applicable in urban land use planning according to DIN18005.

  • Calculating noise in working areas
    The Indoor Module is ideally suited for the analysis of the noise situation in factory buildings and for the determination of the sound propagation (SAK) according to VDI 3760.

  • Calculating aircraft noise
    IMMI's Aircraft Noise Module was developed specifically to meet the requirements of aircraft noise prediction. The IMMI software meets the requirements of the German Federal Environment Agency for a program for the calculation of noise protection areas at airports according to AzD/AzB 2008.

  • Noise mapping and action planning
    IMMI enables precise noise mapping according to the EU Environmental Noise Directive 2002/49/EC for road traffic noise, rail traffic noise, industrial noise and aircraft noise.

  • Calculating air pollutants
    With the Pollutant Module in IMMI, the dispersion calculation of gas, dust and odor is possible according to the particle model (TA Luft 2002/AUSTAL2000) as well as the Gauss model (TA Luft 1986).

IMMI for Calculating Industrial and Commercial Noise

IMMI facilitates the implementation of all current standards such as ISO 9613-2 or CNOSSOS-EU

As different as the existing industries in our world are, as diverse are the noise sources that can result from them. Building services installations, parking lots, loading processes, industrial plants, wind energy plants, public traffic, public address systems – the list can be extended ad infinitum.

For almost all noise sources, IMMI offers supporting functions and tools to facilitate modeling.

Thus, the user interface allows even the inexperienced user to model different noise situations, from issues around neighborhood noise to the creation of noise maps of large industrial plants.

IMMI for Calculating Traffic and Rail Noise

IMMI is ideally suited for the calculation of traffic noise according to national standards and is convenient to use for structural planning according to EU-Directive 2002/49/EC – CNOSSOS-EU

Probably no other type of noise affects as many people as traffic noise, especially road traffic noise. The extent of the noise sources and the fact that the guideline values are on average 5 dB higher than for industrial noise in specific countries means that traffic routes have a large radius of impact.

Whether road, rail or waterway, we have mastered all traffic routes and this for almost all country-specific regulations.

Especially in the planning of new traffic routes, IMMI can demonstrate its strengths: the fast calculation of large-scale models, the comparison of different variants, the input assistance for emission values or the automated height calculation of noise barriers – to name only a few advantages.

IMMI for Calculating Noise in Working Areas

IMMI allows for the calculation of noise in work places and supports room acoustic design according to DIN 18041

The physiological and psychological impact of noise at work is one of the major causes of occupational illnesses. This makes the targeted planning of noise reduction measures in the planning phase of working rooms all the more important.

Our Indoor Noise Module, which is available to all IMMI users free of charge, supports you in this area. As an addition to the geometric sound propagation model, you receive an easy-to-use tool for room acoustic design based on DIN 18041.

The module is ideally suited for the analysis of the noise situation in factory buildings and for the determination of the sound propagation (SAK) according to VDI 3760. 

IMMI for Calculating Aircraft Noise

IMMI's aircraft noise module was developed specifically for the requirements of aircraft noise prediction

The noise characteristics of aircraft noise cause short but high level peaks, which can cause sleep disturbances for affected residents in the vicinity of airports. IMMI meets the requirements of the German Federal Environment Agency for a program for the calculation of noise protection areas at airports according to ECAC.CEAC.Doc. 29.


Features of the Aircraft Noise Module

  • Support of German (AzB 2008, VBUF, DIN 45684-1, BUF) and European (ECAC. CEAC. Doc. 29 2nd and Directive EU 2015/996 (CNOSSOS-EU-Adaptation) rules and regulations
  • Calculation of the equivalent continuous sound levels for day (LAeq, day) and night (LAeq, night) as well as the calculation of the frequency-maximum level criterion NAT (Lp, Schw) and the wake-up frequency Nawr (DLR study) at immission points and in the grid
  • Modeling according to the DES data acquisition system
  • Import/Export via QSI interface according to DIN 45687
  • Emissions database of all aircraft classes (AzB 1975+1983+1999, DIN 45684-1, ECAC.CEAC Doc 29 3rd Edition, BUF) with APU application and taxiing traffic
  • Determination of the day protection zones 1 and 2 and the night protection zone according to the law on protection against aircraft noise
  • Import and evaluation of radar data (FANOMOS) and immission calculations from radar recordings 

Noise mapping according to directive 2015/996 with IMMI (CNOSSOS-EU)

Noise mapping, exposure analysis, and action plans – IMMI is just the right software for these challenging tasks

The issue of noise emissions and immissions plays an important role in urban planning processes. You can use IMMI's full range of features for corresponding investigations: the import of GIS data sets, segmented calculation in the network, the creation of calculation lists for comparison of different variants or exposure analyses.

Probably the most challenging task is noise mapping according to the EU directive. IMMI has been and still is used successfully in numerous projects: whether for a city like Berlin, federal states like Bavaria or Baden-Württemberg, or for counties in the UK.


Noise mapping according Directive 2015/996 for road traffic noise, railway noise, industrial noise and aircraft noise (CNOSSOS-EU)

  • According to CNOSSOS-EU with national implementation all over Europe
  • Throughout the EU according to national regulations
  • In Germany, in accordance with the requirements of the noise mapping regulation (34. BImSchV) combined with §§ 47 a-f BImSchG 

The calculation of strategic noise maps for the noise indicators LDEN and LNight is carried out in 10 m increments and at a height of 4 m, separately for each type of noise. The exposure analysis for evaluation of the affected persons according to directive 2015/996 is realized by calculating facade levels. The performance features multicore, segmented calculation, and ACC – distributing the calculation in the network – are for the calculation of noise maps and facade levels on any number of computers ensuring short computing times.

Powerful functions for noise mapping support you in executing your projects

  • Quality assured according directive 2015/996 (Testcases from Germany) and ISO/TR 17534-4 
  • Data import etc. via: .OSM, .XML, ArcGIS, QSI, DXF, ASCII
  • Unlimited number of obstacles (buildings, walls)
  • Support of large-size terrain models and simplifying functions
  • Input of the building use (e.g. residential building, school, kindergarten, hospital, uninhabited), number of storeys, dwellings, inhabitants
  • Automatic calculation in the network
  • Numerous control functions for quality assurance
  • Data export
  • Evaluation functions: Create conflict maps, hotspot analysis, differential grids.

Noise action plans

With noise action plans, cities and municipalities have a considerable influence on the reduction of road traffic noise. For noise action plans, we determine hot spots, develop reduction concepts in close collaboration with the planning committees, demonstrate the effectiveness of measures, plan quiet areas and provide support in reporting to the EU.


IMMI Calculating Air Pollutants According to TA Luft

With the pollutant module you can calculate the dispersion of gases, dusts and odors

Air quality is directly related to human well-being. Despite positive trends, some air pollutants, such as NO2 and PM10, continue to exceed the current limit values for the protection of human health. This makes a reliable tool for modeling air pollutant distributions all the more important.

For this purpose, IMMI provides two dispersion models: a simple Gaussian model and the long-range particle model according to VDI 3945, part 3, which is available as a reference implementation of the German Federal Environment Agency AUSTAL2000. With these models a multitude of immission control tasks can be performed, such as dust dispersion in building rubble recycling plants or odor immission forecasts in the vicinity of livestock farms.


The IMMI Air Pollution Module provides the following options:

I. Lagrangian Air Dispersion Model – AUSTAL2000


IMMI's comfortable data editing and mapping features are used with the official German implementation of the Lagrangian model compliant with VDI 3945-3. IMMI acts as the user interface whereas AUSTAL2000 is used as the Lagrangian CPU core. The development of this common CPU core was funded by the German government in order 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 CPU core directly. The whole digitizing 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.

II. 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 tried and tested German TA-Luft, Annex C of 1986.

Please contact me personally


I am happy to support you with questions concerning the functionalities and application areas of IMMI – before purchase, during implementation and in daily use.

Denise Müller Foto

Dipl.-Ing. (FH) Denise Müller