VDI 3783 Blatt 15.1:2019-08

Simplified procedures (screening methods) created for quick and pragmatic assessment of the relevance of air pollutants are an important help regarding approval procedures. The simplified methods for determination of separation distances described in the standard are valid for well-defined or diffuse point sources, as well as horizontally extended sources (line or area sources) with a release height of up to 20 m above ground level, which emit the air pollutants nitrogen oxide (NOx), sulphur oxide (SO2) and ammonia (NH3). Ground level concentration and deposition of these air pollutants decline constantly off a certain distance from the emission source. Thus, there is a minimum distance, off which a given concentration or deposition value is undercut. The distances according to this standard are distances independent of the position which are applied for the estimation of the relevance of an emission source regarding the long-term average (usually yearly average value) of concentration or deposition. Furthermore, methods for determining the minimum distance for combinations of several sources and diverse air pollution are presented in the standard and the procedure is extended to acidic equivalents. The procedure described in the standard can for instance be applied for checking the compliance of irrelevance values according to the Technical Instructions on Air Quality Control (TA Luft) as well as further minor values, cut-off criteria or similar. By means of these distances, the size of assessment and calculating areas for dispersion calculations in the context of assessing the deposition in sites of community importance can be determined.

07.060, 13.040.01