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Laboratory accredited according to ISO/IEC 17025 – BELAC Certificate n° 588-Test

The ambulatory olfactometry, a measure of odour carried out at the study site that determines the distance of perception.


Concentration – diffuse sources

ambulatory olfactometryAmbulatory olfactometry is another way to measure the odour impact of an activity on its environment. It enables assessment of the distance over which an odour can be perceived. This odour measurement is carried out at the study site. Ambulatory olfactometry allows all odour sources, in particular diffuse sources such as odours emanating from the movement of materials, running water or open-air storage, to be taken into account.

This odour measurement is performed by an odour panel on site. This panel may also be accompanied by site representatives or local residents, which gives the process a community dimension, and promotes understanding and cooperation between the parties involved.


weather stationEmission measurement using human perception.

A panel, at least two observers, is tasked with visiting the area affected by the olfactory pollution at different times. Each person tours the emission site area in different directions, usually in a zigzag and perpendicular to the direction of the wind. The panel member notes the exact spot where they no longer perceive the odour from the source. 

This location is marked on a map and the distances are averaged across the various panel members. This technique takes into account all contributing factors: olfactory perception, meteorological parameters, configuration of the site and its locality, etc. Following measurement, the atmospheric dispersion model is configured and an iterative retromodelling exercise is used to asses the odour flow from this source during measurement. Generally, the odour flow rate obtained is expressed in Sniffing Units per second (SU/s).

This technique is in the process of being standardised within European: CEN-TC264-WG27

Measure the impact of diffuse odour sources, contact Julien Delva.