Map Viewing Service (WMS) of the dataset: Regulated zone of the PPRT of the Gratecap establishment in the municipality of La Rochelle in Charente-Maritime

For PPRTs, the environmental code defines a single category of zones for zones (L515-15 et seq.): areas at risk. Unlike natural RPPs, PPRTs never have restricted areas that are not directly exposed to risk.
Depending on the hazard level, each TRPP area is subject to an enforceable settlement. The PPRT regulations generally distinguish two types of zones:
1- ‘Building prohibited areas’, known as ‘red areas’, where the hazard level is high and the general rule is the prohibition on construction;
2- ‘prescribed areas’, known as ‘blue zones’, where the hazard level is average and the projects are subject to requirements adapted to the type of issue.
The instructions in the PPRT development guide add a gradation within the “red zones” and “blue zones”.

针对PPRT，环境法规依据L515-15及后续条款，将相关区域划定为单一类别：风险区域。与天然RPP不同，PPRT不存在未直接暴露于风险的限制区域。
依据风险等级，每个TRPP区域均需遵循可强制执行的管控要求。PPRT相关法规通常将区域划分为两类：
1. 建筑禁止区域，俗称"红色区域"：该区域风险等级较高，原则上禁止建设活动；
2. 指定管控区域，俗称"蓝色区域"：该区域风险等级中等，相关项目需遵循适配问题类型的管控要求。
PPRT编制指南中的指引内容进一步对"红色区域"与"蓝色区域"增设了分级细则。