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Day of Environmental Meteorology 2018 more information...

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Dispersion modelling in compliance with the German Technical Instructions on Air Quality Control (TA Luft): gaseous air pollutants

As a rule, an immission prognosis in compliance with the German Technical Instructions on Air Quality Control (TA Luft) is necessary for the approval of an installation that emits (or will emit) polluted air into the atmosphere. The key element of the immission prognosis is the dispersion modelling. The installation, for which a permit is required, is integrated in a computer model in order to ascertain in advance to what extent air pollutants emitted in the future will reach the surroundings and affect the air quality there. iMA carries out the dispersion modelling using officially recognized simulation models. More information in german...

 

 

Dispersion modelling in compliance with the German Technical Instructions on Air Quality Control (TA Luft): dust and dust substances

In addition to gaseous air pollutants, many commercial or industrial installations also emit dust. Depending on the process, heavy metals or other substances (dust substances) may also be bound in the dust particles. Dust is also frequently released diffusely, i.e. the emission of dust-laden air into the atmosphere is not controlled through stacks, but comes from a diffuse area or volume source at ground level. This is the case, for instance, when handling bulk materials. Dust is also emitted by agricultural holdings or motor traffic. As a rule, an immission prognosis in compliance with the German Technical Instructions on Air Quality Control (TA Luft) is necessary for the approval of a installation that emits (or will emit) dust and/or dust substances into the atmosphere. The key element of the immission prognosis is the dispersion modelling. The installation, for which a permit is required, is integrated in a computer model in order to ascertain in advance to what extent dust and dust substances emitted in the future will reach the surroundings and affect the air quality there. iMA carries out the dispersion modelling using officially recognized simulation models. More information in german...

 

 

Dispersion modelling in compliance with the Guideline on Odour in Ambient Air (GOAA; dt. GIRL)

In view of their flexibility, immission prognoses for odours cover a wide range of applications. They are generally selected when planning new installations in order to prove that no serious impact will be caused by new emissions. More information in german...

 

 

Dispersion modelling in compliance with the German Technical Instructions on Air Quality Control (TA Luft) - ammonia (NH3)

Ammonia NH3 is an air pollutant primarily emitted these days from agricultural holdings with livestock. The compound is important in terms of nitrogen immission in vegetation with particular regard to sensitive plants and ecological systems. TA Luft initially stipulates assessment on the basis of a clearance distance regulation. If the distance cannot be adhered to due to proximity to vegetation worthy of protection, usually a dispersion modelling in compliance with the German Technical Instructions on Air Quality Control (TA Luft) for ammonia NH3 follows – in contrast to the clearance distance regulation, this namely allows a spatial differentiation of the immission area according to the main wind directions, for example. More information in german...

 

 

Dispersion analyses: traffic

No matter whether an urban road or a busy motorway – qualified traffic planning requires information on immissions from motor traffic. More information in german...

 

 

Dispersion modelling in complex (steep) terrain

A large proportion of installation locations – from the agricultural holding to the coal-fired power plant – is to be found in undulating to mountainous surroundings. Due to the usually very irregular distribution of the contours, reference is also made to “complex terrain”. TA Luft includes a special passage for dispersion modelling in complex terrain. More information in german...

 

 

Dispersion modelling in complex (steep) terrain – beyond the German Technical Instructions on Air Quality Control (TA Luft)

TA Luft defines limits for the application of the standard method when the terrain is too steep. The solution: prognostic wind field models allow dispersion modelling without methodical restrictions. More information in german...

 

 

Dispersion modelling of complex building structures

In many cases, emission sources are close to the ground – be it in the case of motor traffic, diffuse sources from the storage of dusty materials in the open, the cut of silage on an agricultural holding, or the open window of a foundry or of a paint shop. In all of these cases, buildings in the immediate vicinity and on the dispersion path of the atmospheric pollutants have to be taken into account in the dispersion modelling. TA Luft includes a special passage for such cases. More information in german...

 

 

Dispersion modelling with cooling towers

Cooling towers are an integral Part  of the process cycle in many power stations. The water vapour develops its own dynamics and, depending on the weather conditions, can influence the dispersion of atmospheric pollutants that are emitted from flues in the vicinity. The dispersion modelling that takes into account the effect of water vapour from cooling towers is more complex, but is by all means feasible using the standard methods. More information in german...