ABSTRACT
Of the five senses, odor is the most evocative and least understood. Odor testing seems
mysterious and odor data mythical to most practitioners. In millennium past the "practice of
odor" was in the hands of wizards, magicians, and experts. For years engineers and operators
have relied on “odor experts” to interpret odor testing results. Today odor, odor control, and
odor nuisance are understandable subjects for plant operators, facility managers, engineering
practitioners, and citizens.