The Mayor's Ambient Noise Strategy - Greater London Authority

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The Mayor’s Ambient Noise Strategy Mayor of London 257 acoustically soft ground such as grassland. Low frequencies can thus become more prominent at greater distances. Major airport Defined by Environmental Noise Directive 2002/49/EC as a civil airport with more than 50,000 aircraft movements (a movement being a take-off or a landing) a year. Major railway Defined by Environmental Noise Directive 2002/94/EC as a railway with more than 30,000 train passages a year. Major road Defined by the EU Environmental Noise Directive as a road with more than 3 million vehicle passages a year. Mixed Mode A form of runway use at Heathrow when both main parallel runways are used simultaneously for landings and take offs (both in the same direction, of course). Alternation (see above) may be suspended exceptionally, for example, when unusual weather conditions mean that the holding stacks have become full. Music Noise The noise from the music and vocals during a concert or sound checks, and not affected by other local noise sources, such as traffic. Music Noise Level (MNL) The A-weighted continuous equivalent sound level of the Music noise measured at a particular location. The ‘Code of Practice on Environmental Noise Control at Concerts’ Noise Council, 1995, refers to a 15 minute A-weighted continuous equivalent sound level, L Aeq, 15 min , of the music noise, measured 1 metre from the façade of relevant noise sensitive premises. Neighbour or Neighbourhood noise Noise from household appliances, radios, televisions, music systems, noisy pets, DIY activities, construction sites, intruder alarms, parties or similar events. Night time Generally taken as the period from 2300 to 0700 hours, unless otherwise specified. Noise ‘Unwanted sound’. Noise includes vibration, except where the context indicates otherwise. Noise is classified as a pollutant in the European Directive on Integrated Pollution Prevention and Control. Noise Abatement Zone The Control of Pollution Act 1974 introduced powers to declare Noise Abatement Zones. These provided local authorities with a relatively sophisticated means of controlling and, where justified, reducing noise from commercial and industrial premises. For
258 Mayor of London The Mayor’s Ambient Noise Strategy example, noise reduction notices could be served. Few zones were implemented, but powers remain available. Noise Action Statement Statement, to accompany ‘strategic referrals’ (see below). It would specify the Noise Exposure Category or Categories (see Appendix A5, Table 9) into which the site fell; the noise issues considered, in terms of sources, levels, methods and assumptions; and the noise mitigation measures incorporated (for types of measures, see paragraphs 13-19 of Planning Policy Guidance Note 24, and paragraphs 4F.22-26 of this strategy). Noise audit Systematic examination of a situation, building or proposal (e.g. traffic management scheme) to identify any noise and vibration implications and how best to mitigate them, or, where practicable, secure improvements (see also ‘Sound audit’). Noise and Number Index (NNI) an index formerly used to describe aircraft noise around airports. Noise and Track Keeping (NTK) system A computerised system for monitoring noise levels measured on site and using radar track data to identify aircraft which are not keeping within required limits. Due to changes in wind direction and other factors, aircraft cannot follow tracks perfectly. An aircraft would typically be counted as ‘off track’ if it was more than 1.5 kilometres either side of the nominal centre line of a Noise Preferential Route (see below). In London, NTK systems are in use at Heathrow and London City Airports. Noise or sound environment This term is used to refer to the allencompassing experience of noise and/or sound in a place. It includes issues of context, meaning and sound quality as well as loudness. Noise map Noise mapping is the representation of acoustic data in a cartographical format. Noise maps are in most cases computer-generated drawings showing outdoor noise levels laid over a base of geographical information, such as building outlines and streets. They typically show ‘sound immission contours’ (see ‘immission’ above). Noise nuisance has been defined by the World Health Organisation as ‘a feeling of displeasure evoked by noise’. Statutory nuisance has a more specific meaning and is subject to legal action under the Environmental Protection Act 1990.
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