Health and Ecological Risk Assessment

Health and Ecological Risk Assessment is a structured process that evaluates the likelihood and severity of adverse effects arising from chemical, physical and biological stressors in both human populations and ecosystems. At its core, the discipline integrates hazard identification, exposure assessment and risk characterisation to inform evidence-based decision-making. In human health assessments, this often involves quantifying exposure pathways—such as ingestion of contaminated water or inhalation of airborne pollutants—and estimating dose–response relationships to derive indicators like hazard quotients and incremental lifetime cancer risks. Ecological assessments apply similar principles to non-human species and ecological communities, employing metrics such as Predicted No-Effect Concentrations (PNECs) and species sensitivity distributions, and considering processes like bioaccumulation, biomagnification and habitat alteration. Across both domains, modern approaches harness geospatial analysis, multi-omics datasets and systems biology models to refine predictions, reduce uncertainty and prioritise management actions that safeguard biodiversity, ecosystem services and public health.

Research from Nature Portfolio

Recent longitudinal studies have combined satellite imagery with health surveillance data to demonstrate that rapid urbanisation and agricultural intensification are closely linked to declining groundwater quality and rising burdens of water-related illnesses. In one district, nitrate concentrations in drinking-water sources surged alongside increased methemoglobinemia in infants, while elevated calcium and magnesium were associated with higher rates of urinary tract infections and dental caries. In urban areas, geospatial mapping of physico-chemical parameters has enabled the computation of composite Water Quality Indices and Synthetic Pollution Indices at neighbourhood scales, revealing zones of “poor” to “very poor” water quality driven by aged infrastructure and improper waste disposal. Multi-season sampling in rural aquifers has further shown that faecal indicator bacteria exceed acceptable limits in over half of sources during dry and wet periods, with risk indices indicating that more than 80% of wells pose high risks to community health, underscoring the need for targeted treatment systems and systematic epidemiological monitoring.

Health and Ecological Risk Assessment publication trend

The graph below shows the total number of articles in health and ecological risk assessment across all publications each year (not limited to Nature Index journals).

Technical terms

Water Quality Index (WQI): A composite metric that aggregates multiple physico-chemical and microbiological water parameters into a single score to facilitate monitoring and communication of water quality status.

Synthetic Pollution Index (SPI): A weighted index that characterises overall pollution by normalising and combining concentrations of key contaminants relative to regulatory thresholds.

Multi-omics: An integrative approach that combines genomic, transcriptomic, proteomic and metabolomic data layers to elucidate comprehensive biological responses to stressors.

Network Toxicology: A systems biology method that maps interactions among chemicals, molecular targets and pathways to predict adverse outcomes through network modelling of toxicological data.

Safe-by-Design (SbD): A proactive strategy that embeds hazard identification and minimisation principles into early stages of material or product development to prevent risks rather than mitigate them after the fact.

References

1. Human Health Risk Assessment.
2. Impact of land use/land cover changes on water quality and human health in district Peshawar Pakistan. Scientific Reports (2021).
3. Assessment of drinking water quality using Water Quality Index and synthetic pollution index in urban areas of mega city Lahore: a GIS-based approach. Scientific Reports (2024).
4. A Network Toxicology Approach for Mechanistic Modelling of Nanomaterial Hazard and Adverse Outcomes. Advanced Science (2024).
5. Decision support for selection of new materials considering socio-economic and broader environmental aspects. Sustainable Production and Consumption (2023).
6. Learning from Safe-by-Design for Safe-and-Sustainable-by-Design: Mapping the current landscape of Safe-by-Design reviews, case studies, and frameworks. Environment International (2023).