Surface data representing the airborne noise present on the right-of-way of the \#x27;EPT12. It was developed from a Ln indicator, its title comes from the English language: L for Level = level and night & #x3D; night. The night is from 10pm to 6am. This indicator s' expresses in dB(A) and corresponds to averages over the relevant time periods.
__Origin__
Lden and Ln noise indicators are used for the development of strategic noise maps (this is a regulatory requirement).
__Partner organisations__
EPT Grand-Orly Seine Bièvre
[See this page on geo.data.gouv.fr](https://geo.data.gouv.fr/fr/datasets/6fc2ae141ce4d508aa16ac732ce1b6254c507783)
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