“…The concept is complex and may be considered as a perception, an emotion, an attitude or a mixture of these (Berglund et ai, 1987), although these concepts have not yet been evaluated individually. With this complexity in mind, it is not surprising that personal factors have been shown to influence odor annoyance, including age (Steinheider and Winneke, 1993;Zeidner and Shechter, 1988), gender (Deane and Sanders, 1978) and attitude toward pollution source, and to industry and authorities in general (Evans et ai, 1988). Other important factors include intensity (Cavalini etal., 1991), frequency (Hangartner and Wuest, 1994;Steinheider and Winneke, 1993) and quality (Winneke and Kastka, 1987) of the exposure.…”