IMMI for the calculation of air pollutants according to TA Luft 2021

With the pollutant module, you can calculate the dispersion of gases, dusts and odours in a quality-assured, compliant and smooth manner

Air quality is directly related to human well-being. Despite positive trends, some air pollutants such as NO2 and PM10 still exceed the applicable limit values for the protection of human health. This makes it all the more important to have a reliable tool for modelling air pollutant distributions in order to calculate the dispersion of gases, odours and dusts.

IMMI provides the current dispersion model – AUSTAL – for this purpose. On 14 September 2021, the new Technical Instructions on Air Quality Control (TA Luft) were published in the Joint Ministerial Gazette, No. 48-54. Permitting procedures must therefore be carried out in accordance with the new TA Luft from 1 December 2021.

For this purpose, the Federal Environment Agency provides the reference implementation AUSTAL as a calculation kernel, which is fully available for calculations as of IMMI 2021 Update 01.

It can be used to carry out a large number of immission control tasks such as pollutant dispersion in quarries, open-cast mines, construction waste recycling plants, biogas plants, plants for the production of wood pellets or odour immission forecasts in the vicinity of livestock facilities.

Thanks to these advantages, the calculation of air pollutants with IMMI succeeds safely and smoothly

  • Intuitive user interface for easy use of the AUSTAL calculation kernel
  • Dispersion calculations according to Annex 2 of TA Luft 2021
  • Calculation of a total of 74 pollutants - gases, dusts and odours
  • Plume superelevation with three-dimensional superelevation model PLURIS
  • Implementation of meteorological boundary layer profiles according to VDI 3783, Sheet 8 (2017)
  • Precipitation intensity as time series calculation - calculation of wet deposition
  • Databases for managing meteorological data - Annual statistics and time series
  • Graphical representation of the roughness length using the roughness cadastre LBM-DE2012
  • Fast calculation via multicore and nested computational networks
  • Graphical and tabular output of input and output data (results)
  • Calculations with the Gaussian plume model according to TA Luft 1986 and ÖNORM M 9440 as well as according to AUSTAL2000 (TA Luft 2002) round off the application possibilities of IMMI around pollutants.

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