(2013). A discussion whether the different national odour impactcriteria to protect the same land use would result in similar separationdistances is found in Sommer-Quabach et al. (2014). Thepeak-to-mean factor used to account for the short-term receptionof odour by the human nose varies from country to country and cantake on values between 1 and 10. All countries except Austria useeither 1 (no peak-to-mean effect) or a constant value. In Austria, thepeak-to-mean factor is assumed to be stability-dependent and todecrease with increasing distance from the source, caused by turbulentmixing. Consequently, the decrease is strongest for unstablestratification and is less pronounced the more stable the stratificationis estimated. A discussion of this concept against constantpeak-to-mean factors is available from Schauberger et al. (2012).They demonstrate that the peak-to-mean factor depends on severalparameters, like stability of the atmosphere, intermittency, traveltime, or distance from the source. The assumption of a constantpeak-to-mean factor can therefore only be used as a very roughestimate.As a result of the Austrian peak-to-mean approach outlined inSection 2.2, peak-to-mean attenuation curves are obtained, eitheron the basis of assumptions available from the literature (Robins,1979, Fig. 3) or on the basis of the Obukhov stability parameterOSP, estimated from three-axis ultrasonic anemometer data (Fig. 4).The former curves are site-independent, whereas with the latter,