Traffic-induced Immissions

Even though emissions are generally decreasing traffic-induced immissions still play an important role, especially in urban areas. In some cities the permitted number of exceedings in respirable dust concentrations cannot be kept. The same goes for the annual limit of nitrogen dioxide.

In such cases the respective authorities are legally obliged to come up with a clean air plan for the future. Here we offer our assistance through careful cause analyses and action plans. Based on these we conduct model calculations to prove the positive effect of the suggested actions. Until the clean air plan is actually realized efficiency controls through calculations and measurements are necessary.

For land use and single object planning the federal building act requires an environmental report which points out possible effects of the plans, e.g. on the air quality. But prognoses for traffic-induced immissions are not only advisable when the emission rates change - for instance, new buildings can cause the ventilation to deteriorate and thus influence the future pollutant concentration in certain areas. In general, traffic-induced immissions should always be considered when urban cultivation is intensified.

Depending on the task at hand and the required degree of detail we use simple screening models (MLuS, ISIS) or more sophisticated streaming and dispersion models like MISKAM. AUSTAL2000, the standard model of TA Luft, is only applied every once in a while because its limitations are usually breached when dealing with traffic-induced immissions set free within cultivated areas.