Table describing the Noise Zones in the Environment (Type A) of a large infrastructure — Area exposed by noise in day/evening/night to more than 55 decibels (Lden)

Noise level areas describe a noise exposure situation based on a noise indicator or area affected by noise. They are mainly used for the preparation of strategic noise maps pursuant to Article R.572-5 of the Environmental Code. __Origin__ The noise levels emitted by a given infrastructure during an average day are evaluated using numerical models producing isophone curves translated into noise zones, according to the index recommended for all modes of transport at European level, namely the Lden index and the Ln index. This resource is built geographically for a given PPBE as the smallest perimeter encompassing both the noise zones N_BRUIT_ZONE_BRUIT_S of the strategic noise maps associated with it, but also of the problem areas described in the resource N_BRUIT_ZONE_ENJEUX_S. The PPBEs, which are approved by the Prefect, must be re-engineered and revised every 5 years. Updates to strategic noise maps must cover several aspects of acquisition, data processing and publication of results: — with correction, if applicable, on date N+ 1, of errors made when drawing up documents on date N, — with the addition of all new data (new lanes, new buildings...) created between date N and date N+ 1. __Partner organisations__ DDT Aveyron __Links annexes__ * [XML metadata view](http://ogc.geo-ide.developpement-durable.gouv.fr/csw/all-dataset?REQUEST=GetRecordById&SERVICE=CSW&VERSION=2.0.2&RESULTTYPE=results&elementSetName=full&TYPENAMES=gmd:MD_Metadata&OUTPUTSCHEMA=http://www.isotc211.org/2005/gmd&ID=fr-120066022-jdd-ecd44bfc-5b56-4ecd-b507-63a3be45a864) [See this page on geo.data.gouv.fr](https://geo.data.gouv.fr/fr/datasets/abef05fe39bac67e4186d15238bec67b09911b85)