Octave band data indicating the level of noise according to the strategic noise mapping of road sources across England.
PLEASE NOTE ALL DATA IS UNWEIGHTED
The day-evening-night level (Lden) is a noise indicator for overall annoyance based upon annual average A-weighted long-term sound over 24 hours with a 5 dB(A) penalty for evening noise (19:00-23:00) and a 10 dB(A) penalty for night-time noise (23:00-07:00). Unweighted octave band levels are provided.
The 16-hour equivalent continuous level (Leq,16h) is a noise indicator which describes the annual average steady noise level over the 16-hour daytime period (07:00 to 23:00) which contains the same sound energy as the actual fluctuating sound across the same period. Unweighted octave band levels are provided.
The day level (Lday) is a daytime noise indicator based upon annual average A-weighted long-term sound over the daytime period (07:00-19:00) which contains the same sound energy as the actual fluctuating sound across the same period. Unweighted octave band levels are provided.
The evening level (Leve) is an evening noise indicator based upon annual average A-weighted long-term sound over the evening period (19:00-23:00) which contains the same sound energy as the actual fluctuating sound across the same period. Unweighted octave band levels are provided.
The night level (Lnight) is a night-time noise indicator based upon annual average A-weighted long-term sound over the night period (23:00-07:00) which contains the same sound energy as the actual fluctuating sound across the same period. Unweighted octave band levels are provided.
Noise levels are modelled on a 10m grid at a receptor height of 4m above ground, with a lower threshold cutoff of 35dB for the Lnight metric, and 40dB for all other metrics. Data is available for all road traffic sources.
The provided octave band levels are for 63Hz, 125Hz, 250Hz, 500Hz, 1kHz, 2kHz, 4kHz and 8kHz for each metric listed.
This data is a product of the strategic noise mapping analysis undertaken in 2022 to meet the requirements of the Environmental Noise (England) Regulations 2006 (as amended). Attribution statement: © Department for Environment, Food & Rural Affairs copyright and/or database right 2024. All rights reserved.
