Night 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 50 dB(A) The Ln (Night for Night) is the indicator of the mean night noise level (22h-6h). The seizure was made for a scale of cartographic restitution of 1/10 000th. The cards will be updated every 5 years.