Written by Sarah Laurie, The

Fresh medical evidence from Australia supports scientific claims of a direct causal link between wind turbine low-level pressure pulses and symptoms of sickness in humans – even up to 20 miles away.

Witness statements from residents and the extract of Acoustician Les Huson’s expert opinion are now up as documents on the website for people to use as they see fit to educate others.

In a nutshell noise expert Les Huson has found a remarkable correlation (86% of the time) between Gus Gardner’s symptoms as recorded in his diary of “bolts of pressure” and transient pressure pulses of infrasound detected by Les’s infrasound pressure monitor from the Macarthur wind turbines. Gus was blinded to the acoustic data at the time he recorded his symptoms.

Thus the evidence to support our hypothesis of a direct causal link between wind turbine generated infrasound pressure pulses and specific symptoms is mounting. There have been numerous other rural residents in Australia living or working near large wind turbines who have reported similar sudden pressure “bolt” sensations – dropping fit farmers to their knees (not easily done), or “thumps in the chest” and then feeling very unwell. I would be very interested to hear from anyone with a history of symptoms like this (contact:

This is the first time to my knowledge that we have captured any acoustic data proving these pressure peaks occur at a time when someone was experiencing these sudden intense symptoms. Acousticians I have discussed this symptom complex with previously think it may be caused by summation of pressure peaks from multiple wind turbines ie a cumulative effect, and these people are just in the “wrong place” when those pressure peaks from multiple wind turbines combine. We have never previously captured the measurements of pressure at the time the symptoms were occurring.

Les Huson’s data seems to support that hypothesis, but more work needs to be done to confirm it including replicating these pressures in a laboratory situation.

Les also found that the infrasound from the wind turbines at Leonards Hill travelled over 30km and the attenuation followed the pattern of the NASA experiments in the 1980’s ie attenuated at 3 dB per doubling (audible sound attenuates at a much faster rate of 6 dB per doubling)

However the infrasound generated by 140 turbines at Macarthur does not attenuate in the same way when it is measured within 6.4 km of the nearest wind turbine. His measurements showed that there was effectively NO attenuation at all between 1.8 and 6.4 km.

In some instances the pressure peaks measured were even greater at 6.4km than inside homes closer to the wind turbines.

Les is preparing his data for publication, so cannot share the full report submitted to the Tribunal, however he has given permission for the extract of his expert opinion to be circulated. He is also actively sharing the information with colleagues in Australia and internationally, and with state based bureaucracies with a direct interest in this issue.

Most importantly he stated that “I find it entirely plausible that infrasound can cause nuisance and disturbed sleep in communities surrounding wind farm developments similar to the Macarthur and Leonards Hill developments.”

The links are here: (Les Huson’s expert witness statement extract summarising his findings) (resident who experiences the pressure bolts) (resident who lives 3km away) (resident who lives 5km away and cannot see the turbines)

I hope this information is widely circulated and used to educate as many people as possible about both the noise & pressure fluctuation impacts and the latest acoustic data from large wind turbines in an array on flat land (140 VESTAS V 112 3 MW wind turbines).

Heartfelt thanks again to the Macarthur witnesses who have given their permission for the information to be circulated further than the Cherry Tree Tribunal hearing, and to those who donated to the Foundation to enable us to present the information with appropriate legal support to the Tribunal.

Sarah Laurie,

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