Olfactory emissions are determined by sampling and analysis of the emissions of odorific sources. This involves sampling the gas emitted according to a recognized sampling protocol suitable for the type of source, followed by a determination of the odor intensity using olfactometric analysis.

Two types of sampling may be conducted:

• For point or channelized sources, sampling is conducted using a lung or a pump and a glass or stainless steel rotameter.
• For surface sources such as compost winrows or settling ponds, the odor samples are taken by means of the OdoFlux™ dynamic flow chamber. This permits us to quantify the gas emitted at the soil/air or water/air interface. This technique allows us to sample the gas actually emitted by a surface source without disturbing its natural surface flow.