Most low-frequency sound and “infrasound” produced by turbines is significantly below the human hearing threshold. Wind turbine infrasound levels are far lower than those experienced during everyday activities such as traveling in a vehicle, walking by the ocean, or standing outside in the wind. Scientific evidence confirms that this sound is not dangerous and that any low-frequency waves produced are not harmful to those nearby. As reported in a recent study by the Massachusetts Department of Public Health: “… the weight of the evidence suggests no
association between noise from wind turbines and measures of psychological distress or mental health problems.”
(Source: http://www.mass.gov/eea/docs/dep/energy/wind/turbine-impact-study.pdf)