1 INTRODUCTION The scope and applications of odor and control sometimes confused by uses of In the past, odor has been used to me either the an perception of smell, referring to the sensation, or that which is referring to the stimulus. To eliminate confusion, odor is best used only for the former meaning, and odorant should be defined as any odorous substance. Odor intensity, then, the magnitude of the olfactory sensation produced on exposure to an odorant. Odor control is a term that can be used to describe any process that makes olfactory experiences more acceptable to people. The perceptual route to this objective is usually, but not always, the reduction of odor intensity. An alternative route is the change of odor quality in some way that is considered to be an improvement