factors identified in the social sciences literature (i.e. aspect of risk perception, such as familiarity and level of awareness of the risks, level of concern regarding environmental health risks, and perceived level of exposure) which are based on respondents point of view and are, therefore, subjective in nature. This latter set of determinants is not typically included in WTP studies of environmental health risks; however, these factors are considered important in the social sciences for obtaining value preferences (Fischhoff and Furby, 1988; Johnson and Slovic, 1995; El-Fadel and Massoud, 2000). Therefore,we considered themto be of potential interest given their relationships to the perception and acceptability of risks. We drafted four hypotheses based on the (social sciences) literature, to guide our statistical analyses: