Noise or sound pollution consist of sounds produced by human activity or machinery, cars or unbalanced activity affecting humans or animals.
The nature sounds are a powerful rarietate, noise is usually weak and short. Sounds like the murmur of a spring water, birds chirping, the sound waves, a waterfall, rustle the leaves are always pleasant man, they soothe, relieve stress, but these sounds are becoming increasingly rare, replaced by industrial and transportation noise.
Most human activity generates noise: alarms, works in construction, energy, intense music, powerful speech, sound sirens, bells, horns, noise from road traffic and air (especially at supersonic air traffic has a source noise with powerful implications. Some aviation engines can be heard from 30 km). English word "noise" which corresponds to the term "noise" comes from the Latin word "noxia," which could translate 'injury, wound ".
In modern cities, especially in cities, pollution is the main cause of road traffic, increasing, caused both by increasing the number of vehicles and their speed. Highway noise often exceeds 80 dB. No small towns are protected by noise when crossed by major traffic arteries.
Noise pollution is one of the biggest problems facing Europeans today, with air pollution and waste management. According to statistics of World Health Organization (WHO), half of Europeans live in a permanent noise and one third suffer from insomnia due to noise pollution. Street noise pollution is not only embarrassing, but also the objects produced by the household appliances or noisy neighbors.
In European countries 40% of the population is exposed to road traffic noise with an intensity of 55 dB and 20% noise over 65 dB. If you count all the noise from transport, when over 50% of Europe's population does not sound normal comfort at home and 30% is affected during the night. Noise pollution is most severe in developing countries through increased traffic density and the absence of belt circulation in big cities. It is estimated that in these countries Arcurs loudness is 24 hours in the 75-80 dB.
Modern habitat is characterized by the constant deterioration of urban noise environment. Results of the action of urban noise pollution monitoring, undertaken by the Institute of Public Health, in collaboration with specialized in the territory, have shown an upward continuous dynamic exposure levels from mean values ??of 50 dB (L) in the early 80 to about 70 dB (L) in 1999.
