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The assessment of odour dispersion downwind of manure application sites is required to establish science-based separation distances that allow for the minimization of odour nuisance to farming neighbours. Nasal Rangers, or trained odour assessors, are gaining popularity for odour intensity determination. Training of Nasal Rangers and the development of appropriate field protocols have been established by St. Croix Sensory Inc. as well as by the University of Alberta odour team. Wind tunnels and flux chambers are useful for obtaining surface odour concentrations that are averaged over the sampling period. However, the emitting sources and weather conditions often produce instantaneous spikes of odour that may cause annoyance to local residents but that may not be captured by chamber sampling. Nasal Rangers are better suited than the chamber techniques to monitor and record these instantaneous odour events. Trained odour assessors are also useful at determining duration and offensiveness of odour events in the field.