The Mayor's Ambient Noise Strategy - Greater London Authority

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The Mayor’s Ambient Noise Strategy Mayor of London 225 neutral, but could favour richer areas - for example, if it were cheaper and easier to reduce noise in suburban or ex-urban areas with more space for barriers, more scope for further traffic calming, etc., than in denser urban areas. Studies for monetary valuation need to characterise noise exposure better than in much previous work. For example, if external noise indicators are used, any systematic variations in noise reduction provided by the building fabric need to be accounted for. Noise valuation based on property price differentials is likely to be highly problematic in a complex and stressed housing market such as London. References 1 ‘Design Manual for Roads and Bridges’ Volume 11, Section 3, Part 7 ‘Traffic Noise and Vibration’ DETR, 1994 2 Wright P and Grimwood C. ‘Strategic management of noise: a UK perspective’ Clean Air and Environmental Protection, Vol 30(1), January/February 2000, pp 11-15 3 Skinner C et al. ‘The National Noise Incidence Study 2000/2001 (UK)’ Volume 2, BRE, February 2002, p 16. 4 Cobbing C and Rickaby M. ‘Perception and Significance of Transport Noise Changes’ Proceedings of Institute of Acoustics, Volume 21(2), 1999. 5 Kihlman T. ‘Noise Abatement and Improvement: The Systematic Approach’ Noise News International, June 2001, pp 97-101’ 6 Wright P and Grimwood C. ‘Strategic management of noise: a UK perspective’ Clean Air and Environmental Protection, Vol 30(1), January/February 2000, pp 11-15
226 Mayor of London The Mayor’s Ambient Noise Strategy A3 typical noise levels and indicative noise reductions Table 9 below shows approximate sound pressure levels for some typical noises. There is a very large variation around any of the following figures. In practice, environmental noise levels are continuously changing through time. More details would normally be specified for figures used in noise control practice. Table 9 Typical noise levels Noise source/situation Sound Pressure Typical subjective description Level in dB(A) 30 m from military jet at take-off 140 Painful, intolerable Pop concert, near stage 105 Night club (typical locations within) 100 Extremely noisy Pneumatic drill, at 7 m 95 Powered lawnmower at operator’s ear, Older diesel lorry from footway 90 Very noisy Ringing alarm clock at 1m 80 Car or light van at 60 km/h from 7m 75 Domestic vacuum cleaner at 3 m, Telephone ringing at 2 m 70 Noisy Busy general office (typical locations within) 60 Normal conversation at 1 m 55-60 Boiling kettle at 0.5 m 50 Refrigerator humming at 2 m 40 British Museum Reading Room 35 Bedroom in quiet area with windows shut 20-30 Very quiet Remote rural location with no specifically identifiable sound 20 Threshold of hearing 0 Uncanny silence source: Various, including Draft Technical Guidance Note IPPC H3, Part 2, October 2001 and ‘Bothered by Noise’ DETN/2, DETR (now DEFRA), 2001 Summary of indicative noise reductions The following noise reductions are indicative only, and should be treated with considerable caution. They may be regarded as typical ‘rule of thumb’ assumptions, and are conservative. They are expressed as reductions over typical existing situations; in practice, of course, such situations can differ.
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