The number of methanisation production sites increase in Europe. However, the installation of a new site sometimes creates problems with the neighborhood of the sites. The main concern is odours. To respond to these fears, the odour levels emitted by 3 biogas production plants were measured. In order to study the methanisation diversity, different waste treatment plants have been monitored. The waste came from farming (manure, slurry), WWTP sludge, or agro-food were compared. For each plant, 5 sources were investigated. A one year survey indicates that odour emissions changed according to the season. For each site, the main potential odour annoyance impact comes from the input preparation area.