气味: 是指一种或多种化学物质接触并刺激人体的嗅觉神经后，使人体对此物质产生的感觉记忆。"气味物质"这个词是指使人体嗅觉神经产生 "感应" 的任何或每一种化学物质。"气味感应" 可能在一种或多种 "气味物质"出现的情况下发生。The term "odor" refers to the perception experience when one or more chemicals come in contact with the receptors on the olfactory nerves and "stimulate" the olfactory nerve. The term "odorant" refers to any chemical in the air that is part of the perception of odor by "stimulating" the olfactory nerves. Odor perception may occur when one odorant (chemical) is present or when many odorants (chemicals) are present.
组成现在生活的每天市民的活动，商业活动和工业生产，使我们允满在一个非常复杂的"气味物质"的混合体中。与气味接触成为我们生活的一部分，也是社会活动的一部分。然而，周而复此，市民会发现有些气味实在是令人 "恶心"。在此，让我们来,展示一个气味导致恶心的 "概念模式"，这就是 "市民抱怨金字塔" (如下图). 在这个 "建筑中", 从 "气味特点"开始，历经 "气味强度"， "持续时间" 到"发生频率" 这样一砖一瓦地积累，最后导致了 "恶心"的"气味感应" 经历，从而爆发 "抱怨"。Ambient air in the community holds a mixture of odorous chemical (odorants) from the everyday activities of its citizens and the commercial and industrial enterprises that make up modern day society. The daily exposure to odorants is a part of life and a part of the community. However, from time to time, citizens find some odors objectionable and a nuisance. A conceptual model for what leads to an odor nuisance is the "Citizen Complaint Pyramid" (See following figure) which starts and builds with "Odor Character", "Odor Intensity", "Episode Duration", and "Episode Frequency". The cumulative effect of these four building blocks creates the nuisance experience that may lead to a citizen complaint.