When studying the sense of smell it is always a good idea to look at the other senses as well. Many features in the individual senses have the same characteristics, because evolution and biology is economic. So if we know something about seeing or hearing, then there is a certain chance that the sense of smell works in a similar fashion. And we do know a lot more about seeing or hearing than about smelling.
The approach offers a series of unique advantages over less comprehensive odor detection techniques. Not only do the e-noses provide quantifiable measurements of odor levels at one given location, but the system can use atmospheric dispersion modeling to show the full extent and intensity of an odor plume. An odor monitoring system like OdoWatch combines automatic central monitoring of odor emissions with a clear display showing odor concentration that incorporates current weather data and is updated continuously.