are 2 or 3 months .. at least that, especially at night, I feel more and more frequently and more heavily on aircraft noise caused by their passage, but I do not think that for some months now have reduced the minimum values \u200b\u200bof flight .. and if I think I notice this at night, when the city is more quiet, I imagine that these sounds are also resent strong beautiful day, it just get lost in the noise of the city, and then airplanes fly very low, even during daylight hours .. why this? The Legislative Decree of 19 August 2005, no 194 (implementing Directive 2002/49/EC on the assessment and management of environmental noise.) Had been issued just to deal also with this form of noise .. but just read the 1st article of the decree in the 2nd paragraph "This decree does not apply to noise generated by the exposed person from activities' home, or your neighborhood, it 'the noise at work produced by the same assets' employment or on means of transport or due to military activities in military areas ", to understand that the planes that I feel all right I am authorized to make all that noise! \u200b\u200bthem because the planes flying low over my home town and where I feel the aircraft noise are carrying out a military activity, or chemical substances for various purposes and they do in much of the globe that is in fact becomes the setting for their operazioni.Bè that is, if my first sleep was disturbed by the noise of air now is the thought about what and why we put some chemical materials!
some links on the calculation of the flight altitude of an airplane: http://www.tankerenemy.com/2008/06/relazione- propagation-of-the-sound-e.html
http://www.tankerenemy.com/2006/11/desumere-la-quota-di-volo-di.html
http://www.tankerenemy.com/2008/03/stima-trigonometrica-della-quota-di-un.html
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