For the attention of the World Health Organization Panel revising the European Noise Guidelines to include Industrial Wind Turbine Noise

1.1 Normal human hearing can discern a change of 3 dBA in noise level; thus Amplitude Modulation should be clearly defined using a methodology similar to Den Brook. 1.2 Noise testing for wind turbine noise levels should include the requirement for fast averaging at 125 or 200 millisecond bins. 1.3 Amplitude Modulation should be regulated as a unique compliance requirement separate from the average noise levels. 1.4 Recommended limits for wind turbine noise should include an upper limit of not more than 40 dBA for the peak amplitude modulation, in addition to the averaged noise.