ABSTRACT
Despite common perceptions that the human olfactory system is relatively insensitive in comparison with that of other species, humans can detect many odorants in extremely low concentrations. For example, at concentrations where many odors can just be detected or even recognized, there are few health consequences from inhalation exposure, yet simple awareness of an odor can produce annoyance or concern about the potential consequences of exposure and thereby impact mood and well-being (Shusterman et al., 1991). For this reason, the establishment of methods for evaluating the detectability, intensity, and hedonic characteristics of environmental odorants is a critical step in their regulation and management.
