Overall noise level indicator — Cumul

Indicates the noise levels induced by road, air and rail transport infrastructure and classified facilities for environmental protection. (ICPE) The mapping represents isophone curves plotted by 5 dB(A) from 55 dB(A) The Lden (Day Evening Night for Day Evening and Night) is the indicator of the average sound level for the entire 24-hour day. It is calculated over the year for the noises recorded at different periods of the day, to which is applied a weighting for the more sensitive periods (+ 5 dB(A) in the evening and + 10 dB(A) at night). It is therefore not an actual or measured noise level, but a weighted indication. The seizure was made for a scale of cartographic restitution of 1/10 000th. The seizure was made for a scale of cartographic restitution of 1/10 000th. The cards will be updated every 5 years.