A team of Iowa researchers has concluded that there's no actionable evidence that the sound of wind turbines is a danger to public. Instead, the report authors found that reported symptoms of hearing loss or poor sleep are more likely related to people’s attitudes and beliefs about wind development. Residents in areas seeing wind development sometimes report headaches, sleep disturbance, hearing loss and other symptoms. A team of researchers from the University of Iowa, the Iowa Policy Project and The Iowa Environmental Council explored potential causes of these symptoms. Based on an overview of peer-reviewed studies, they found that there is not suffiecient evidence to show sound or sound pressure from turbines is a directly causing adverse health effects.