1. Introduction
Separation distances to protect the neighbourhood from odour
annoyance can be obtained from dispersion models. Such models
predict the ambient odour concentration on an hourly or halfhourly
basis. This time series of concentration values allows a
calculation of the percentage of the time in a year during which the
threshold odour concentration will be exceeded. This can be
compared to a tolerated exceedence probability depending on the
land-use category. Usually, separation distances between an odour