Rating level

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The assessment level Lr is a measure for the identification of the sound immission acting on a location during each assessment time. In order to determine an assessment level , the averaging level Laeq of the noise to be assessed is converted to an assessment level, taking into account the duration of exposure and the abnormality of the noise (tonality, impulsiveness, information content). It cannot therefore be determined directly by measurement. It represents a measure of the exposure of those affected by noise at workplaces and in the vicinity of sound sources such as commercial operations, traffic routes, sports facilities and airports. Immissionsschutzgesetz) so that noise-reducing measures can be taken if necessary.


Noise in the workplace

The rating level corresponds to the workplace-related average level during a work shift of usually 8 hours. Here, peak loads (peaks) must also be taken into account.

According to the German Noise and Vibration Occupational Safety and Health Ordinance , an assessment level of less than 80 dB A must be observed. At higher levels, special protective measures to reduce noise are necessary.

Traffic noise

In the case of road noise , rail noise or air traffic noise , the level information is divided into daytime (6:00 a.m. to 7:00 p.m.), evening times (7:00 p.m. to 10:00 p.m.) and night time (10:00 p.m. to 6:00 a.m.). Different limit values ​​apply to these time periods, which are again determined depending on the immission location from the calculated averaging level.

The averaging takes place energetically , see Bel , example: If the residents are woken up twice in the loudest hour of the night by a souped-up moped, which causes a level of 60 dB in each bedroom for 5 seconds, and the rest of the time with 20 dB relative quiet prevails, the mean value is around 35 dB, because 10 s · 10 6 + (1 h - 10 s) · 10 2 = 1 h · 10 3.459 .

literature

  • Christin Rothe: Occupational Safety and Health from A-Z . 5th edition, Rudolf Haufe Verlag GmbH, Munich 2009, ISBN 978-3-448-10084-6 .
  • Michael Ebner, Joachim Knoll: Danger to the audience's hearing at events . Commentary on DIN 15905-5, 1st edition, Beuth Verlag, Berlin 2009, ISBN 978-3-410-16722-8 .

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