Wind Turbines - Health Hazard

Alec N. Salt, Ph.D., of  Washington University in St Louis Cochlear Fluids Research Laboratory

 in a report titled

WindTurbines can be Hazardous to Human Health 

Large wind turbines generate very low frequency sounds and infrasound (below 20 Hz) when the wind driving them is turbulent. The amount of infrasound depends on many factors, including the turbine manufacturer, wind speed, power output, local topography, and the presence of nearby turbines (increasing when the wake from one turbine enters the blades of another). The infrasound cannot be heard and is unrelated to the loudness of the sound that you hear. Infrasound can only be measured with a sound level meter capable of detecting it (and not using the A-weighted scale). Video cameras and other recording devices are not sensitive to infrasound and do not reproduce it.

After describing the ear's sensitivity to infrasound, Dr Salt lists several ways that infrasound could affect you even though you cannot hear it. They are:
  1. Causing Amplitude Modulation (pulsation) of heard sounds.  
  2. Stimulating “subconscious” pathways. 
  3. Causing Endolymphatic Hydrops.
  4. Possibly Accelerating Presbyacusis (making you go deaf faster over the years)

 

Read More from Washington's University in St Louis Cochlear Fluid Research Laboratory (Link)

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