Thursday, 28 February 2013

Climate Spectator: Busting the infrasound barrier
4 Feb 2013

The South Australian Environment Protection Authority has just released a report finding that infrasound-very low frequency sound (between 1-20 hertz) is not noticeably greater in households nearby to wind farms than other locations.

It is claimed by some groups and individuals opposed to wind farms, such as the Waubra Foundation, that wind turbines cause a wide array of illnesses to people in nearby residences due to the infrasound they apparently emit.

The report by Resonate Acoustics took measurements of infrasound (dB G) over a period of approximately one week at seven locations in urban areas and four locations in rural areas including two residences approximately 1.5km away from the wind turbines.

As the report explains, infrasound is not a unique phenomenon associated with wind turbines. Noise generated by people and associated activities within an office space was one of the most significant contributors to measured infrasound levels, with measured infrasound levels typically 10 to 15dB(G) higher when a space was occupied.

Car traffic may also influence the infrasound level in an urban environment, with measured levels during the daytime periods typically 10dB(G) higher than between midnight and 6am, when traffic would be expected to be at its lowest.