Nationwide Assessment of Microplastic Contamination and Polymer Risk Indices in Brazilian Coastal Sands (2023–2024)

This dataset compiles georeferenced information on microplastic (MP) contamination in beach sands sampled across the Brazilian coastline between 2020 and 2024, as part of the MicroMar Project. The dataset includes 4,000+ sampling points distributed along 1,000 beaches, representing all coastal states of Brazil. For each sample, metadata include geographic coordinates (longitude and latitude), sample identification code, state, municipality, and beach name. Quantitative data comprise microplastic concentrations normalized by dry sand mass (MPs_kg, particles per kilogram), as well as three synthetic environmental risk indices: the Polymer Load Index (PLI), Polymer Hazard Index (PHI), and Pollution Ecological Risk Index (PERI). These indices were calculated from polymer composition and hazard weighting following established frameworks. This dataset provides a baseline for assessing spatial patterns, polymer-specific risks, and regional drivers of microplastic pollution in Brazilian coastal ecosystems. It supports national and international research efforts on marine litter and coastal contamination.本数据集作为MicroMar项目的一部分，收录了2020年至2024年间巴西海岸线沿线海滩砂采样所得的微塑料（microplastic, MP）污染地理参考信息。数据集涵盖分布于巴西1000余处海滩的4000余个采样点，覆盖巴西所有沿海州域。每份样本的元数据包含地理坐标（经度与纬度）、样本识别码、所属州、市县及海滩名称。定量数据包括以干砂质量归一化的微塑料浓度（MPs_kg，即每千克颗粒数），以及三项合成环境风险指数：聚合物负载指数（Polymer Load Index, PLI）、聚合物危害指数（Polymer Hazard Index, PHI）与污染生态风险指数（Pollution Ecological Risk Index, PERI）。上述指数依据既定研究框架，通过聚合物组成与危害权重计算得到。本数据集可为评估巴西沿海生态系统中微塑料污染的空间分布模式、聚合物特异性风险及区域驱动因素提供基准参照。其可为国内外海洋垃圾与海岸污染相关研究工作提供有力支撑。