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WHO Environmental Noise Guidelines 2018

World Health Organization - Regional Office for Europe

The long-awaited latest guidance from the World Health Organization was released yesterday (10th October 2018). Of particular interest to Hayes McKenzie is the section specifically concerned with wind turbine noise. A quick flip to Section 34 on page 77 tells you all you need to know which is that the WHO are conditionally recommending that turbine noise should not exceed an Lden of 45dB. Lden is the average noise level over one year, where noise during the evening is penalised with a +5 dB correction, and a +10dB correction applied for noise at night. In the case of wind turbine noise, which is continually varying from day to day, depending on the wind speed and direction, it will be almost impossible to establish compliance with this limit through measurement alone. As a means of 'impact' assessment, however, it has some distinct advantages which are discussed in Andy McKenzie's paper for Acoustics Australia in 2012 and in a paper presented at the Institute of Acoustics Autumn Conference in 2015 by Andy along with fellow wind turbine noise specialist Andrew Bullmore. Both of these papers are available in the Publications - Our Published Papers section of this web site.
Posted 2018 Link to Document(s)

Wind Turbine Noise Amplitude Modulation Penalty Considerations

Bowdler et al

Institute of Acoustics Spring Conference 2018, Cardiff

There was much discussion among interested parties following the publication of a report for the UK Government which recommended a 'penalty scheme' for regulating AM but little information on how to use it. This paper, presented by Malcolm and others, discusses different factors which require additional consideration when considering a potential penalty to be used in combination with the IoA AM noise working group method for quantifying AM.

Posted 2018 Download

Site Experience with Wind Turbine Noise AM Analysis

Cand et al

Institute of Acoustics Spring Conference 2018, Cardiff

The IoA AM Noise Working Group method for quantifying amplitude modulation (AM) in wind turbine noise has allowed analysis of AM from wind turbines to be carried out at various sites over long periods of operations. Most of these sites are existing wind farms without AM planning controls and, therefore, although an agreed assessment method is available, the data can be presented in different ways. This paper presents analysis of data from different sites by Malcolm, Tom and others and the observations which resulted from this analysis.

Posted 2018 Download

A Planning Condition for Wind Turbines

McKenzie et al

UK Institute of Acoustics Bulletin Nov/Dec 2017

The UK Institute of Acoustics November/December 2017 Monthly Bulletin contains this article, contributed to by Andy McKenzie et al, presenting proposed wording for a planning condition on noise for wind farms, or individual wind turbines, which takes account of amplitude modulation within the noise charecter.

Posted 2017 Download