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standard to express noise level over an entire day. It imposes a penalty on sound levels during evening and night and it is primarily used for noise assessments of airports, busy main roads, main railway lines and in cities over 100,000 residents. The penalty for sound production during evenings and
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275:{\displaystyle L_{den}=10\cdot log_{10}\left({\frac {1}{24}}\left(12\cdot 10^{\frac {L_{day}}{10}}+4\cdot 10^{\frac {L_{evening}+5}{10}}+8\cdot 10^{\frac {L_{night}+10}{10}}\right)\right)}
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can be considered a weighted average of the yearly individual noise level during day, evening and night.
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The exact hours of the three periods may be chosen differently by individual EU member states.
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nights is due to higher nuisance perception during quieter hours and to prevent
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Airport
Engineering: Planning, Design, and Development of 21st Century Airports
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Norman J. Ashford; Saleh
Mumayiz; Paul H. Wright (6 April 2011).
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Where the long-term average noise levels are defined as:
435:. Springer Science & Business Media. p. 331.
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414:[Health risks from environmental noise].
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432:The Science and Applications of Acoustics
412:"Gesundheitsrisiken durch Umgebungslärm"
387:Handbook of Noise and Vibration Control
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462:. John Wiley & Sons. p. 724.
390:. John Wiley & Sons. p. 15.
384:Malcolm J. Crocker (5 October 2007).
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360:Day-night average sound level
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18:day–evening–night noise level
526:. You can help Knowledge by
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518:This article relating to
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36:for nearby residents.
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40:Definition
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583:Audiology
218:⋅
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349:See also
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16:The
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