As odour is increasingly annoying closed-by residential areas, many approaches were made in the past year, developments achieved and research work done in order to better understand the problem and especially in order to better protect people from severe annoyance. A main aim within this progress – and a basic need – is the development of reliable, repeatable and recognized odour measurement method and procedures. Major parts herein are sampling of odour emissions and the procedure of measurement. These have to serve for the assessment of impact and subsequent definition of odour impact prevention policies. In addition, the characterization of odour containing liquids by means of the odour emission capacity OEC is explained, and recent developments and results of research work are presented.