Infrasound and low-frequency noise

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Large wind turbines have been known since the early 1980s to produce infrasound and low-frequency noise (ILFN) that is intrusive and detrimental to health, both psychologically and physiologically.[1]

Most existing noise regulations – if they exist at all – use A-weighted noise measurement, which emphasizes the range of human conscious hearing. Thus they fail to take ILFN into account. (They usually also fail to consider amplitude modulation, another characteristic that makes wind turbine noise more annoying.)

In 2011, Denmark imposed a 20 dBA limit for low-frequency (10–160 Hz) noise inside homes.[2] A few localities have imposed limits defined by C-weighted measurements in addition to A-weighted, e.g., 50 dBC at the property line.[3]