3.4. Differences in variables that influenced WTP estimates of air pollution and noise
Based on the extended models, perception- and attitude-related variables significantly affected the WTP values for air pollution and noise. Environmental concerns, respondent sensitivity to pollutants, difficulty relaxing in polluted locations, and disagreement with the notion that pollution-reduction policies seek to improve wellbeing were the four variables that affected the WTP estimates for general risks, LE, and the combined-risk scenario. However, awareness of health risks did not significantly affect the estimate of either pollutant. Overall, we observed that country often significantly predicted pollution and noise estimates (as shown in the basic models), but this effect changed when perception-related variables were taken into account (as seen in the extended models).