Map Viewing Service (WMS) of the dataset: Regulated zone of the PPRT of the Société SDLP — site of the Fief de la Repentie in the commune 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”.针对潜在技术风险预防区域（PPRT），环境法典针对风险区域（L515-15条及后续条款）划定了单一类别：即受风险波及的区域。与天然RPP不同，PPRT从不涵盖未直接暴露于风险中的限制区域。依据危险等级的差异，每个TRPP区域均需遵守强制性管控要求。PPRT相关规制通常将区域划分为两类： 1. 被称为"红色区域"的"禁止建设区"：该区域危险等级偏高，通用准则为全面禁止建设活动； 2. 被称为"蓝色区域"的"指定建设区"：该区域危险等级中等，相关建设项目需遵循适配于风险类型的合规要求。 PPRT编制指南中的操作细则，进一步在"红色区域"与"蓝色区域"内部增设了分级标准。