Английская Википедия:Day–evening–night noise level

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The day–evening–night noise level or LШаблон:Sub is a 2002 European standard to express noise level over an entire day. It imposes a penalty on sound levels during evening and night[1] and it is primarily used for noise assessments of airports, busy main roads, main railway lines and in cities over 100,000 residents.[2][3][4] The penalty for sound production during evenings and nights is due to higher nuisance perception during quieter hours and to prevent sleep deprivation for nearby residents.

Definition

LШаблон:Sub is calculated as:[5]

<math>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)</math>

Where the long-term average noise levels are defined as:

Part of the day hours penalty (dB)
day 07:00 - 19:00 0
evening 19:00 - 23:00 5
night 23:00 - 07:00 10

The exact hours of the three periods may be chosen differently by individual EU member states.

The formula for LШаблон:Sub can be considered a weighted average of the yearly individual noise level during day, evening and night.

See also

References

Шаблон:Reflist


Шаблон:EU-law-stub