Rail noise 2022 LDEN of the Métropole de Lyon

2010: reference date of the sound source.

2012:
approval of the noise map deliberation map

Lden index in dB(A):
global noise for a day.

(L=level, d=day (day),e=evening (evening),n=night (night)

Breaks the day into three periods:

the period of the day runs from 6 a.m. to 6 p.m.

the evening period runs from 18.00 to 22.00;
it is weighted by a factor 5,

the night period runs from 22 hours to 6 hours;
it is weighted by a factor 10.