Systematic review of emerging environmental contaminants: sources, environmental fate, and impacts.
Objectives This review aimed to synthesize recent advances in the understanding of emerging contaminants (ECs), including per- and polyfluoroalkyl substances, pharmaceuticals, personal care products, microplastics and nanoplastics, endocrine-disrupting chemicals, and engineered nanomaterials. It critically assessed their sources, environmental pathways, transformation mechanisms, and ecological and human health impacts, while identifying knowledge gaps and future research priorities. Methods A systematic literature review was conducted according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses framework. Peer-reviewed research articles and critical reviews were retrieved from Scopus, Web of Science, and PubMed. Emphasis was placed on studies that used advanced analytical techniques, including high-resolution mass spectrometry, nuclear magnetic resonance spectroscopy, Fourier-transform infrared spectroscopy, and biosensor-based detection methods. Results The findings indicated that ECs are characterized by high environmental persistence, complex transformation pathways, bioaccumulation, and trophic transfer potential. Reported impacts included endocrine disruption, genotoxicity, antimicrobial resistance, and ecological imbalance. Across global environmental compartments, these pollutants pose long-term risks to ecosystems and human health. Their distinctive partitioning behavior and environmental persistence challenge standard ecological assessment frameworks and underscore the need for comprehensive toxicological evaluations and robust regulatory oversight to mitigate long-term biological accumulation and adverse physiological effects in aquatic and terrestrial wildlife. Conclusion This review highlights the urgent need for improved regulatory frameworks, standardized monitoring approaches, and sustainable remediation strategies for ECs. By integrating advanced analytical methods, computational tools, and circular economy principles, the review provides a timely contribution to environmental science and policy and supports informed decision-making for environmental protection and public health.