VDI 3783 Blatt 15.1:2018-07

Nitrogen and acid deposition may lead to eutrophication and acidification and thus may have adverse effects on ecosystems, particularly on sensitive habitats. The procedure described in the standard is a screening-method to estimate the relevance of emission sources which produce respective air pollution. Ground level concentration and deposition of these air pollution 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 standard describes simplified methods of determining minimum distances for sources with a construction height of up to 20 m with discharge of the air pollution nitrogen oxides (NOx), sulphur dioxides (SO2) and ammonia (NH3). 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.