Surface data representing the airborne noise present on the right-of-way of the \#x27;EPT12. It was developed from a Lden indicator, its title comes from the English language: L for Level = level, day & #x3D; day, evening & #x3D; evening and night & #x3D; night. The day is from 6am to 6pm, the evening from 6pm to 10pm and the night from 10pm to 6pm. 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/57b325f32eb66897807e26828f71d30b2ea317c0)
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