But computation methods are widely preferred, because of the large amount of yearly averaged locations required. According to the END, the acoustic indicators can be determined by computation or measurement methods. All of these indicators are defined in terms of A-weighted decibels (dBA, dB(A)). These are long-term averaged sound levels, determined over all the correspondent periods of a year. The main noise indicators for noise mapping are Lday, Levening, Lnight and Lden (day-evening-night). Using a simile, we should not worry about the weather, but we must care about the global warming.
NOISE MAPPING NC FULL
The term 'strategic' is very important in this definition, because the management of environmental noise must be made for the long-term in a full area. The main goals of the END are to make a diagnosis of noise pollution in Europe that can lead to action plans, and a noise management that can be implemented in terms of action plans and acoustical planning. ' acoustical planning’ shall mean controlling future noise by planned measures, such as land-use planning, systems engineering for traffic, traffic planning, abatement by soundinsulation measures and noise control of sources ĮU Member States are required to produce strategic noise maps in their main cities, near the main transport infrastructures and near industrial sites. ' action plans’ shall mean plans designed to manage noise issues and effects, including noise reduction if necessary ' strategic noise map’ shall mean a map designed for the global assessment of noise exposure in a given area due to different noise sources or for overall predictions for such an area ' noise indicator’ shall mean a physical scale for the description of environmental noise, which has a relationship with a harmful effect ' environmental noise’ shall mean unwanted or harmful outdoor sound created by human activities, including noise emitted by means of transport, road traffic, rail traffic, air traffic, and from sites of industrial activity. Although some previous approaches had been made, the main international agreement, definitions, and basis for noise mapping were born in relation to the Environmental Noise Directive of the European Parliament and Council (Directive 2002/49/EC of 25 June 2002, commonly referred to as 'the END'), where we can find the following definitions:
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