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People living near wind turbines in Sweden may notice and be annoyed by the noise. Of 754 respondents to a questionnaire, 307 noticed the sound, of whom 31 were annoyed by it. Country dwellers complained more than those in urban areas, and although perception and annoyance correlated with decibel level, complex (hilly or rocky) local terrain was also a major influence in rural areas, as was being able to see the turbines and complainants having renovated their house.house.
The investigators point out that it is not enough for regulatory authorities to consider simple dose-response relations when judging noise pollution; authorities need to consider the effects of differing local topography.