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Atmospheric Microplastics Analysis: Discrepancies, Issues, and Way Forward
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A critical review of atmospheric microplastic research identified major methodological inconsistencies across sampling, digestion, density separation, enumeration, and analytical procedures, concluding that results from different studies are largely incomparable without standardized protocols. Establishing universal methodology for measuring airborne microplastics is urgently needed, as inhalation is a significant human exposure route and unreliable data impedes risk assessment and regulatory action.
The investigation of microplastics (MPs) in terrestrial environments has increased, including studies on atmospheric MPs in indoor and outdoor settings. However, the lack of a well-established and definitive methodology has complicated comparing the results. This article examines previous research on atmospheric MPs, providing an overview of researchers' methodologies. Additionally, it discusses the diversity and limitations of these approaches while suggesting the most effective practices identified thus far. The existing studies vary in qualitative and quantitative methods, such as sample collection, the choice of digestion and density separation techniques, MPs enumeration methods, and analytical procedures. Due to these procedural differences, the results cannot be easily compared. Establishing a standardized procedure would facilitate result comparison and enhance the reliability and credibility of atmospheric MPs studies.
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This review synthesizes current knowledge on atmospheric microplastics, covering their diverse emission sources, physical and chemical aging processes during atmospheric transport, and the range of detection methods used across studies. Airborne microplastics represent a direct inhalation exposure route for humans and an underquantified vector for long-range plastic pollution dispersal, yet inconsistent detection methodologies and complex atmospheric aging mechanisms limit our ability to accurately assess health and climate impacts.
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