site-specific and model-specific attenuation curves are obtained.The approach, originally developed for the Austrian OdourDispersion Model AODM, has been applied in the present investigationalso to the Lagrangian particle diffusion model LASAT, in apost-processing mode. The conversion of values of the OSP to stabilityclasses is done with schemes which are either adopted forReuter/Turner stability classes used in Austria (Table 1a) or for Klug/Manier stability classes used in Germany (Table 1b). The schemesuse different limit values for this conversion. An average value ofthe standard deviations over wind speed can then be determinedfor each stability class like in Table 3. The resulting attenuationcurves do not deviate much, as is demonstrated here for Reuter/Turner classes (Fig. 4a) used with AODM and Klug/Manier classes(Fig. 4b) used with LASAT. Reuter/Turner as well as Klug/Manierstability classes can be determined independently from OSP viaconventional methods (cloud parameters, radiation balance, orvertical temperature gradient, all in combination with wind speed;for an overview, see Piringer et al.'s Chapter 4.6 (2004). Such aconventional method e the radiation balance in combination withwind speed e was used to determine separation distances with theRobins (1979) approach.A comparison between the Robins (1979) peak-to-mean factorswith those determined from ultrasonic anemometer data leads tomore remarkable differences between attenuation curves (compare